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slimbus: Fix out-of-bounds access in slim_slicesize()

Message ID 1523178154-1130-1-git-send-email-geert@linux-m68k.org (mailing list archive)
State New, archived
Headers show

Commit Message

Geert Uytterhoeven April 8, 2018, 9:02 a.m. UTC 
With gcc-4.1.2:

    slimbus/messaging.c: In function ‘slim_slicesize’:
    slimbus/messaging.c:186: warning: statement with no effect

Indeed, clamp() is a macro not operating in-place, but returning the
clamped value.  Hence the value is not clamped at all, which may lead to
an out-of-bounds access.

Fix this by assigning the clamped value.

Fixes: afbdcc7c384b0d44 ("slimbus: Add messaging APIs to slimbus framework")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
 drivers/slimbus/messaging.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/slimbus/messaging.c b/drivers/slimbus/messaging.c
index 884419c37e8419c8..457ea1f8db309cb9 100644
--- a/drivers/slimbus/messaging.c
+++ b/drivers/slimbus/messaging.c
@@ -183,7 +183,7 @@  static u16 slim_slicesize(int code)
 		0, 1, 2, 3, 3, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7
 	};
 
-	clamp(code, 1, (int)ARRAY_SIZE(sizetocode));
+	code = clamp(code, 1, (int)ARRAY_SIZE(sizetocode));
 
 	return sizetocode[code - 1];
 }