diff options
| author |   Silvio Cesare <silvio.cesare@gmail.com> | 2018-05-04 13:44:02 +1000 |
|---|---|---|
| committer |   Kees Cook <keescook@chromium.org> | 2018-06-12 16:19:22 -0700 |
| commit | 353748a359f1821ee934afc579cf04572406b420 (patch) | |
| tree | c386b02a98fa6658d42dce10ce588f99536ea339 | |
| parent | leds: Use struct_size() in allocation (diff) | |
| download | linux-dev-353748a359f1821ee934afc579cf04572406b420.tar.xz linux-dev-353748a359f1821ee934afc579cf04572406b420.zip | |
UBIFS: Fix potential integer overflow in allocation
There is potential for the size and len fields in ubifs_data_node to be
too large causing either a negative value for the length fields or an
integer overflow leading to an incorrect memory allocation. Likewise,
when the len field is small, an integer underflow may occur.
Signed-off-by: Silvio Cesare <silvio.cesare@gmail.com>
Fixes: 1e51764a3c2ac ("UBIFS: add new flash file system")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
| -rw-r--r-- | fs/ubifs/journal.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c index da8afdfccaa6..07b4956e0425 100644 --- a/fs/ubifs/journal.c +++ b/fs/ubifs/journal.c @@ -1282,10 +1282,11 @@ static int truncate_data_node(const struct ubifs_info *c, const struct inode *in int *new_len) { void *buf; - int err, dlen, compr_type, out_len, old_dlen; + int err, compr_type; + u32 dlen, out_len, old_dlen; out_len = le32_to_cpu(dn->size); - buf = kmalloc(out_len * WORST_COMPR_FACTOR, GFP_NOFS); + buf = kmalloc_array(out_len, WORST_COMPR_FACTOR, GFP_NOFS); if (!buf) return -ENOMEM; |