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hfs: prevent crash on exit from failed search 

[ Upstream commit dc2572791d ]

hfs_find_exit() expects fd->bnode to be NULL after a search has failed.
hfs_brec_insert() may instead set it to an error-valued pointer.  Fix
this to prevent a crash.

Link: http://lkml.kernel.org/r/53d9749a029c41b4016c495fc5838c9dba3afc52.1530294815.git.ernesto.mnd.fernandez@gmail.com
Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Cc: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
Cc: Viacheslav Dubeyko <slava@dubeyko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Ernesto A. Fernández 2018-08-23 17:00:31 -07:00 committed by Greg Kroah-Hartman
parent 7d6eba211a
commit ece4ba1c0c
1 changed files with 4 additions and 3 deletions
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7
fs/hfs/brec.c
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@ -75,9 +75,10 @@ int hfs_brec_insert(struct hfs_find_data *fd, void *entry, int entry_len)
if (!fd->bnode) {
if (!tree->root)
hfs_btree_inc_height(tree);
fd->bnode = hfs_bnode_find(tree, tree->leaf_head);
if (IS_ERR(fd->bnode))
return PTR_ERR(fd->bnode);
node = hfs_bnode_find(tree, tree->leaf_head);
if (IS_ERR(node))
return PTR_ERR(node);
fd->bnode = node;
fd->record = -1;
}
new_node = NULL;