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| author | Richard Weinberger <richard@nod.at> | 2018-07-01 23:20:51 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2018-08-15 00:25:20 +0200 |
| commit | 95a22d2084d72ea067d8323cc85677dba5d97cae (patch) | |
| tree | 37301d32e351f1ced8060344148bd4d39dff4517 | |
| parent | 08acbdd6fd736b90f8d725da5a0de4de2dd6de62 (diff) | |
| download | linux-95a22d2084d72ea067d8323cc85677dba5d97cae.tar.gz linux-95a22d2084d72ea067d8323cc85677dba5d97cae.tar.bz2 linux-95a22d2084d72ea067d8323cc85677dba5d97cae.zip | |
ubifs: Check data node size before truncate
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>
| -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 1406765c3ef9..cef0d76d490a 100644 --- a/fs/ubifs/journal.c +++ b/fs/ubifs/journal.c @@ -1393,7 +1393,16 @@ 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); |