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| author | Richard Weinberger <richard@nod.at> | 2018-07-01 23:20:51 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-09 19:56:00 +0200 |
| commit | f6d7acc1d9cae277b0379e8209eaefe59a3fbf79 (patch) | |
| tree | 07dca588f9469737b5bec4722a855e0b42a96e31 /fs/ubifs | |
| parent | 3259dd7176e4d98248f2dcc94f540dbca051ff42 (diff) | |
| download | linux-stable-f6d7acc1d9cae277b0379e8209eaefe59a3fbf79.tar.gz linux-stable-f6d7acc1d9cae277b0379e8209eaefe59a3fbf79.tar.bz2 linux-stable-f6d7acc1d9cae277b0379e8209eaefe59a3fbf79.zip | |
ubifs: Check data node size before truncate
commit 95a22d2084d72ea067d8323cc85677dba5d97cae 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: 1e51764a3c2ac ("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>
Diffstat (limited to 'fs/ubifs')
| -rw-r--r-- | fs/ubifs/journal.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c index 04c4ec6483e5..b2419c855b47 100644 --- a/fs/ubifs/journal.c +++ b/fs/ubifs/journal.c @@ -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); |