diff options
| author | Denis Efremov <efremov@linux.com> | 2019-09-30 23:31:47 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-21 10:42:03 +0100 |
| commit | e5e7acb11772315b28b2c20afa97e37941330eaa (patch) | |
| tree | ef790ee56085f1bad970ed57d365fe7f5fad1751 /drivers/net/wireless/ath | |
| parent | 93b2cdd2a315fad6aac9c7c9ea557c669b06d412 (diff) | |
ar5523: check NULL before memcpy() in ar5523_cmd()
commit 315cee426f87658a6799815845788fde965ddaad upstream.
memcpy() call with "idata == NULL && ilen == 0" results in undefined
behavior in ar5523_cmd(). For example, NULL is passed in callchain
"ar5523_stat_work() -> ar5523_cmd_write() -> ar5523_cmd()". This patch
adds ilen check before memcpy() call in ar5523_cmd() to prevent an
undefined behavior.
Cc: Pontus Fuchs <pontus.fuchs@gmail.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: David Laight <David.Laight@ACULAB.COM>
Cc: stable@vger.kernel.org
Signed-off-by: Denis Efremov <efremov@linux.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net/wireless/ath')
| -rw-r--r-- | drivers/net/wireless/ath/ar5523/ar5523.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/wireless/ath/ar5523/ar5523.c b/drivers/net/wireless/ath/ar5523/ar5523.c index 7a60d2e652da..e492c7f0d311 100644 --- a/drivers/net/wireless/ath/ar5523/ar5523.c +++ b/drivers/net/wireless/ath/ar5523/ar5523.c @@ -255,7 +255,8 @@ static int ar5523_cmd(struct ar5523 *ar, u32 code, const void *idata, if (flags & AR5523_CMD_FLAG_MAGIC) hdr->magic = cpu_to_be32(1 << 24); - memcpy(hdr + 1, idata, ilen); + if (ilen) + memcpy(hdr + 1, idata, ilen); cmd->odata = odata; cmd->olen = olen; |