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staging: most: sound: add sanity check for function argument 

[ 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@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christian Gromm 2021-02-02 17:21:05 +01:00 committed by Greg Kroah-Hartman
parent 7d16e7c161
commit e3ec4af506
1 changed files with 2 additions and 0 deletions
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2
drivers/staging/most/sound/sound.c
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@ -98,6 +98,8 @@ 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];