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s390/numa: correct early_param handling

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When command line options are used without specifying values
(e.g. "emu_size" instead of "emu_size="), the value is NULL. Check that
before performing string operations and further processing.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2019-08-16 15:49:49 +02:00
parent 416f79c23d
commit 915ef7bda7
2 changed files with 5 additions and 4 deletions
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7
arch/s390/numa/mode_emu.c
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@ -558,9 +558,7 @@ static int __init early_parse_emu_nodes(char *p)
{
int count;
if (kstrtoint(p, 0, &count) != 0 || count <= 0)
return 0;
if (count <= 0)
if (!p || kstrtoint(p, 0, &count) != 0 || count <= 0)
return 0;
emu_nodes = min(count, MAX_NUMNODES);
return 0;
@ -572,7 +570,8 @@ early_param("emu_nodes", early_parse_emu_nodes);
*/
static int __init early_parse_emu_size(char *p)
{
emu_size = memparse(p, NULL);
if (p)
emu_size = memparse(p, NULL);
return 0;
}
early_param("emu_size", early_parse_emu_size);

2
arch/s390/numa/numa.c
View File

@ -158,6 +158,8 @@ early_param("numa_debug", parse_debug);
static int __init parse_numa(char *parm)
{
if (!parm)
return 1;
if (strcmp(parm, numa_mode_plain.name) == 0)
mode = &numa_mode_plain;
#ifdef CONFIG_NUMA_EMU