From a40662c90d974a89d2f5d627542b63bed88e72f0 Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" Date: Tue, 20 Apr 2021 20:01:52 +0200 Subject: [PATCH] scsi: BusLogic: Avoid unbounded vsprintf() use Existing blogic_msg() invocations do not appear to overrun its internal buffer of a fixed length of 100, which would cause stack corruption, but it's easy to miss with possible further updates and a fix is cheap in performance terms, so limit the output produced into the buffer by using vscnprintf() rather than vsprintf(). Link: https://lore.kernel.org/r/alpine.DEB.2.21.2104201939390.44318@angie.orcam.me.uk Acked-by: Khalid Aziz Signed-off-by: Maciej W. Rozycki Signed-off-by: Martin K. Petersen --- drivers/scsi/BusLogic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/BusLogic.c b/drivers/scsi/BusLogic.c index 4d8556fb5c68..0bcedd9d8d26 100644 --- a/drivers/scsi/BusLogic.c +++ b/drivers/scsi/BusLogic.c @@ -3436,7 +3436,7 @@ static void blogic_msg(enum blogic_msglevel msglevel, char *fmt, int len = 0; va_start(args, adapter); - len = vsprintf(buf, fmt, args); + len = vscnprintf(buf, sizeof(buf), fmt, args); va_end(args); if (msglevel == BLOGIC_ANNOUNCE_LEVEL) { static int msglines = 0;