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x86/AMD/NB: Fix amd_set_subcaches() parameter type

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This is under CAP_SYS_ADMIN, but Smatch complains that mask comes
from the user and the test for "mask > 0xf" can underflow.

The fix is simple: amd_set_subcaches() should hand down not an 'int'
but an 'unsigned long' like it was originally indended to do.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Daniel J Blueman <daniel@numascale-asia.com>
Link: http://lkml.kernel.org/r/20140121072209.GA22095@elgon.mountain
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dan Carpenter 2014-01-21 10:22:09 +03:00 committed by Ingo Molnar
parent fb53a1ab88
commit 2993ae3305
2 changed files with 2 additions and 2 deletions
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2
arch/x86/include/asm/amd_nb.h
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@ -19,7 +19,7 @@ extern int amd_cache_northbridges(void);
extern void amd_flush_garts(void);
extern int amd_numa_init(void);
extern int amd_get_subcaches(int);
extern int amd_set_subcaches(int, int);
extern int amd_set_subcaches(int, unsigned long);
struct amd_l3_cache {
unsigned indices;

2
arch/x86/kernel/amd_nb.c
View file

@ -179,7 +179,7 @@ int amd_get_subcaches(int cpu)
return (mask >> (4 * cuid)) & 0xf;
}
int amd_set_subcaches(int cpu, int mask)
int amd_set_subcaches(int cpu, unsigned long mask)
{
static unsigned int reset, ban;
struct amd_northbridge *nb = node_to_amd_nb(amd_get_nb_id(cpu));