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| author | Colin Ian King <colin.king@canonical.com> | 2018-11-24 15:34:10 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-13 10:51:56 +0300 |
| commit | f6ea3c03ec082abfe2b6519e93f10fe9ec37c5a2 (patch) | |
| tree | b2694a59d561a9739e1927bdc3a09ef099b381ab | |
| parent | d7e82b903dbd5f0295dad4a807ae1faf4ed5461e (diff) | |
| download | linux-f6ea3c03ec082abfe2b6519e93f10fe9ec37c5a2.tar.xz | |
altera-stapl: check for a null key before strcasecmp'ing it
[ Upstream commit 9ccb645683ef46e3c52c12c088a368baa58447d4 ]
Currently the null check on key is occurring after the strcasecmp on
the key, hence there is a potential null pointer dereference on key.
Fix this by checking if key is null first. Also replace the == 0
check on strcasecmp with just the ! operator.
Detected by CoverityScan, CID#1248787 ("Dereference before null check")
Fixes: fa766c9be58b ("[media] Altera FPGA firmware download module")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/misc/altera-stapl/altera.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/misc/altera-stapl/altera.c b/drivers/misc/altera-stapl/altera.c index ef83a9078646..d2ed3b9728b7 100644 --- a/drivers/misc/altera-stapl/altera.c +++ b/drivers/misc/altera-stapl/altera.c @@ -2176,8 +2176,7 @@ static int altera_get_note(u8 *p, s32 program_size, key_ptr = &p[note_strings + get_unaligned_be32( &p[note_table + (8 * i)])]; - if ((strncasecmp(key, key_ptr, strlen(key_ptr)) == 0) && - (key != NULL)) { + if (key && !strncasecmp(key, key_ptr, strlen(key_ptr))) { status = 0; value_ptr = &p[note_strings + |