From 9f499b8c791d2983c0a31a543c51d1b2f15e8755 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 28 Jul 2024 17:06:20 -0700 Subject: minmax: scsi: fix mis-use of 'clamp()' in sr.c While working on simplifying the minmax functions, and avoiding excessive macro expansion, it turns out that the sr.c use of the 'clamp()' macro has the arguments the wrong way around. The clamp logic is val = clamp(in, low, high); and it returns the input clamped to the low/high limits. But sr.c ddid speed = clamp(0, speed, 0xffff / 177); which clamps the value '0' to the range '[speed, 0xffff / 177]' and ends up being nonsensical. Happily, I don't think anybody ever cared. Fixes: 9fad9d560af5 ("scsi: sr: Fix unintentional arithmetic wraparound") Cc: Justin Stitt Cc: Kees Cook Cc: Martin K. Petersen Signed-off-by: Linus Torvalds --- drivers/scsi/sr_ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/sr_ioctl.c b/drivers/scsi/sr_ioctl.c index a0d2556a27bb..089653018d32 100644 --- a/drivers/scsi/sr_ioctl.c +++ b/drivers/scsi/sr_ioctl.c @@ -431,7 +431,7 @@ int sr_select_speed(struct cdrom_device_info *cdi, unsigned long speed) struct packet_command cgc; /* avoid exceeding the max speed or overflowing integer bounds */ - speed = clamp(0, speed, 0xffff / 177); + speed = clamp(speed, 0, 0xffff / 177); if (speed == 0) speed = 0xffff; /* set to max */ -- cgit