hfsplus: add error checking for hfs_find_init()
hfs_find_init() may fail with ENOMEM, but there are places, where the returned value is not checked. The consequences can be very unpleasant, e.g. kfree uninitialized pointer and inappropriate mutex unlocking. The patch adds checks for errors in hfs_find_init(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by: Christoph Hellwig <hch@lst.de>
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c6d5f5fa65
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@ -212,7 +212,9 @@ int hfsplus_create_cat(u32 cnid, struct inode *dir,
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dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n",
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str->name, cnid, inode->i_nlink);
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hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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if (err)
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return err;
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hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
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entry_size = hfsplus_fill_cat_thread(sb, &entry,
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@ -269,7 +271,9 @@ int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
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dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n",
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str ? str->name : NULL, cnid);
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hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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if (err)
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return err;
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if (!str) {
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int len;
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@ -347,12 +351,14 @@ int hfsplus_rename_cat(u32 cnid,
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struct hfs_find_data src_fd, dst_fd;
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hfsplus_cat_entry entry;
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int entry_size, type;
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int err = 0;
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int err;
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dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
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cnid, src_dir->i_ino, src_name->name,
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dst_dir->i_ino, dst_name->name);
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hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
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err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
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if (err)
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return err;
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dst_fd = src_fd;
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/* find the old dir entry and read the data */
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@ -38,7 +38,9 @@ static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
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sb = dir->i_sb;
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dentry->d_fsdata = NULL;
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hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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if (err)
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return ERR_PTR(err);
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hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
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again:
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err = hfs_brec_read(&fd, &entry, sizeof(entry));
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@ -132,7 +134,9 @@ static int hfsplus_readdir(struct file *filp, void *dirent, filldir_t filldir)
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if (filp->f_pos >= inode->i_size)
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return 0;
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hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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if (err)
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return err;
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hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
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err = hfs_brec_find(&fd);
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if (err)
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@ -124,9 +124,10 @@ static void hfsplus_ext_write_extent_locked(struct inode *inode)
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if (HFSPLUS_I(inode)->extent_state & HFSPLUS_EXT_DIRTY) {
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struct hfs_find_data fd;
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hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
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__hfsplus_ext_write_extent(inode, &fd);
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hfs_find_exit(&fd);
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if (!hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd)) {
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__hfsplus_ext_write_extent(inode, &fd);
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hfs_find_exit(&fd);
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}
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}
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}
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@ -194,9 +195,11 @@ static int hfsplus_ext_read_extent(struct inode *inode, u32 block)
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block < hip->cached_start + hip->cached_blocks)
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return 0;
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hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
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res = __hfsplus_ext_cache_extent(&fd, inode, block);
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hfs_find_exit(&fd);
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res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
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if (!res) {
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res = __hfsplus_ext_cache_extent(&fd, inode, block);
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hfs_find_exit(&fd);
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}
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return res;
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}
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@ -374,7 +377,9 @@ int hfsplus_free_fork(struct super_block *sb, u32 cnid,
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if (total_blocks == blocks)
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return 0;
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hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
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res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
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if (res)
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return res;
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do {
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res = __hfsplus_ext_read_extent(&fd, ext_entry, cnid,
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total_blocks, type);
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@ -503,7 +508,6 @@ void hfsplus_file_truncate(struct inode *inode)
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struct page *page;
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void *fsdata;
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u32 size = inode->i_size;
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int res;
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res = pagecache_write_begin(NULL, mapping, size, 0,
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AOP_FLAG_UNINTERRUPTIBLE,
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@ -526,7 +530,12 @@ void hfsplus_file_truncate(struct inode *inode)
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goto out;
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mutex_lock(&hip->extents_lock);
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hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
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res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
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if (res) {
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mutex_unlock(&hip->extents_lock);
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/* XXX: We lack error handling of hfsplus_file_truncate() */
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return;
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}
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while (1) {
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if (alloc_cnt == hip->first_blocks) {
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hfsplus_free_extents(sb, hip->first_extents,
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@ -195,11 +195,13 @@ static struct dentry *hfsplus_file_lookup(struct inode *dir,
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hip->flags = 0;
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set_bit(HFSPLUS_I_RSRC, &hip->flags);
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hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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err = hfsplus_find_cat(sb, dir->i_ino, &fd);
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if (!err)
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err = hfsplus_cat_read_inode(inode, &fd);
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hfs_find_exit(&fd);
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err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
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if (!err) {
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err = hfsplus_find_cat(sb, dir->i_ino, &fd);
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if (!err)
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err = hfsplus_cat_read_inode(inode, &fd);
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hfs_find_exit(&fd);
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}
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if (err) {
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iput(inode);
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return ERR_PTR(err);
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@ -73,11 +73,13 @@ struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
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if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
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inode->i_ino == HFSPLUS_ROOT_CNID) {
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hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
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err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
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if (!err)
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err = hfsplus_cat_read_inode(inode, &fd);
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hfs_find_exit(&fd);
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err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
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if (!err) {
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err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
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if (!err)
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err = hfsplus_cat_read_inode(inode, &fd);
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hfs_find_exit(&fd);
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}
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} else {
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err = hfsplus_system_read_inode(inode);
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}
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@ -456,7 +458,9 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
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str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
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str.name = HFSP_HIDDENDIR_NAME;
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hfs_find_init(sbi->cat_tree, &fd);
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err = hfs_find_init(sbi->cat_tree, &fd);
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if (err)
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goto out_put_root;
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hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
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if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
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hfs_find_exit(&fd);
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