[PATCH] powerpc/pseries/hvcserver: don't memset pi_buff if it is null

From: Colin Ian King <redacted>

pi_buff is being memset before it is sanity checked. Move the
memset after the null pi_buff sanity check to avoid an oops.

Signed-off-by: Colin Ian King <redacted>
---
 arch/powerpc/platforms/pseries/hvcserver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/hvcserver.c b/arch/powerpc/platforms/pseries/hvcserver.c
index eedb645..94a6e56 100644
--- a/arch/powerpc/platforms/pseries/hvcserver.c
+++ b/arch/powerpc/platforms/pseries/hvcserver.c

@@ -142,11 +142,11 @@ int hvcs_get_partner_info(uint32_t unit_address, struct list_head *head,
 	int more = 1;
 	int retval;
 
-	memset(pi_buff, 0x00, PAGE_SIZE);
 	/* invalid parameters */
 	if (!head || !pi_buff)
 		return -EINVAL;
 
+	memset(pi_buff, 0x00, PAGE_SIZE);
 	last_p_partition_ID = last_p_unit_address = ~0UL;
 	INIT_LIST_HEAD(head);
 

-- 
2.5.0

Hi Colin,

This looks good. Out of curiousity, how did you find it? Code
inspection? Bug? Static analysis?

Not that it's particularly meaningful for such a trivial fix, but FWIW:

Reviewed-by: Daniel Axtens <redacted>

Regards,
Daniel

Colin King [off-list ref] writes:

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Hash: SHA256

On 12/10/15 01:35, Daniel Axtens wrote:

Hi Colin,

This looks good. Out of curiousity, how did you find it? Code
inspection? Bug? Static analysis?

static analysis with cppcheck. I forgot to mention that in the commit
message.

Not that it's particularly meaningful for such a trivial fix, but FWIW

:

Reviewed-by: Daniel Axtens <redacted>

Regards,
Daniel

Colin King [off-list ref] writes:

quoted

From: Colin Ian King <redacted>

pi_buff is being memset before it is sanity checked. Move the
memset after the null pi_buff sanity check to avoid an oops.

Signed-off-by: Colin Ian King <redacted>
---
 arch/powerpc/platforms/pseries/hvcserver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/hvcserver.c b/arch/powerp

c/platforms/pseries/hvcserver.c

quoted

index eedb645..94a6e56 100644

--- a/arch/powerpc/platforms/pseries/hvcserver.c
+++ b/arch/powerpc/platforms/pseries/hvcserver.c

@@ -142,11 +142,11 @@ int hvcs_get_partner_info(uint32_t unit_address

, struct list_head *head,

quoted

 	int more = 1;
 	int retval;
 
-	memset(pi_buff, 0x00, PAGE_SIZE);
 	/* invalid parameters */
 	if (!head || !pi_buff)
 		return -EINVAL;
 
+	memset(pi_buff, 0x00, PAGE_SIZE);
 	last_p_partition_ID = last_p_unit_address = ~0UL;
 	INIT_LIST_HEAD(head);
 
-- 
2.5.0

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On Thu, 2015-08-10 at 19:00:58 UTC, Colin King wrote:

From: Colin Ian King <redacted>

pi_buff is being memset before it is sanity checked. Move the
memset after the null pi_buff sanity check to avoid an oops.

Signed-off-by: Colin Ian King <redacted>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/c13e1c05b22b504bf0d72fc7

cheers