| Message ID | 20190930203147.10140-1-efremov@linux.com |
|---|---|
| State | Awaiting Upstream |
| Delegated to: | David Miller |
| Headers | show |
| Series | [v2] ar5523: check NULL before memcpy() in ar5523_cmd() | expand |
Denis Efremov <efremov@linux.com> wrote: > 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> Patch applied to ath-next branch of ath.git, thanks. 315cee426f87 ar5523: check NULL before memcpy() in ar5523_cmd()
diff --git a/drivers/net/wireless/ath/ar5523/ar5523.c b/drivers/net/wireless/ath/ar5523/ar5523.c index b94759daeacc..da2d179430ca 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;
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> --- V2: check ilen instead of idata as suggested by David Laight. drivers/net/wireless/ath/ar5523/ar5523.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)