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ubifs: Check data node size before truncate 

commit 95a22d2084 upstream.

Check whether the size is within bounds before using it.
If the size is not correct, abort and dump the bad data node.

Cc: Kees Cook <keescook@chromium.org>
Cc: Silvio Cesare <silvio.cesare@gmail.com>
Cc: stable@vger.kernel.org
Fixes: 1e51764a3c ("UBIFS: add new flash file system")
Reported-by: Silvio Cesare <silvio.cesare@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Richard Weinberger 2018-07-01 23:20:51 +02:00 committed by Greg Kroah-Hartman
parent 3259dd7176
commit f6d7acc1d9
1 changed files with 10 additions and 1 deletions
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11
fs/ubifs/journal.c
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@ -1388,7 +1388,16 @@ int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode,
else if (err)
goto out_free;
else {
if (le32_to_cpu(dn->size) <= dlen)
int dn_len = le32_to_cpu(dn->size);
if (dn_len <= 0 || dn_len > UBIFS_BLOCK_SIZE) {
ubifs_err(c, "bad data node (block %u, inode %lu)",
blk, inode->i_ino);
ubifs_dump_node(c, dn);
goto out_free;
}
if (dn_len <= dlen)
dlen = 0; /* Nothing to do */
else {
err = truncate_data_node(c, inode, blk, dn, &dlen);