From: Christian Gromm christian.gromm@microchip.com
[ Upstream commit 45b754ae5b82949dca2b6e74fa680313cefdc813 ]
This patch checks the function parameter 'bytes' before doing the subtraction to prevent memory corruption.
Signed-off-by: Christian Gromm christian.gromm@microchip.com Reported-by: Dan Carpenter dan.carpenter@oracle.com Link: https://lore.kernel.org/r/1612282865-21846-1-git-send-email-christian.gromm@... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/staging/most/sound/sound.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/staging/most/sound/sound.c b/drivers/staging/most/sound/sound.c index 89b02fc305b8..fd9245d7eeb9 100644 --- a/drivers/staging/most/sound/sound.c +++ b/drivers/staging/most/sound/sound.c @@ -86,6 +86,8 @@ static void swap_copy24(u8 *dest, const u8 *source, unsigned int bytes) { unsigned int i = 0;
+ if (bytes < 2) + return; while (i < bytes - 2) { dest[i] = source[i + 2]; dest[i + 1] = source[i + 1];