On 09/14/2010 10:55 PM, Matt Helsley wrote:
> On Tue, Sep 14, 2010 at 03:02:04PM -0500, Nathan Lynch wrote:
>> If ipcshm_restore fails to look up the file object for the region
>> being restored, it should return the error to its caller and not
>> proceed to dereference the file pointer.
>>
>> Signed-off-by: Nathan Lynch <[email protected]>
>
> (Important fix. Adding Oren to Cc)
>
> Reviewed-by: Matt Helsley <[email protected]>
>
>> ---
>> ipc/shm.c | 2 +-
>> 1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/ipc/shm.c b/ipc/shm.c
>> index eed4b9a..1ba9193 100644
>> --- a/ipc/shm.c
>> +++ b/ipc/shm.c
>> @@ -334,7 +334,7 @@ int ipcshm_restore(struct ckpt_ctx *ctx, struct
>> mm_struct *mm,
>>
>> file = ckpt_obj_fetch(ctx, h->ino_objref, CKPT_OBJ_FILE);
>> if (IS_ERR(file))
>> - PTR_ERR(file);
>> + return PTR_ERR(file);
Hrm ... I really don't see what's the problem ;)
Oren.
>
> Odd that the original code didn't trigger any unused result or must check
> warnings. In linux/err.h I already see:
>
> static inline long __must_check PTR_ERR(const void *ptr)
> ...
>
> And in linux/compiler-gcc3.h
> if __GNUC_MINOR__ >= 4
> #define __must_check __attribute__((warn_unused_result))
> #endif
>
> or for those of us using GCC 4.x (linux/compiler-gcc4.h):
> #define __must_check __attribute__((warn_unused_result))
>
> and in my .config I have:
> CONFIG_SYSVIPC=y
> CONFIG_SYSVIPC_CHECKPOINT=y
> ...
> CONFIG_ENABLE_MUST_CHECK=y
>
> plus a simple test:
>
> #include <stdlib.h>
>
> static inline void * __attribute__((warn_unused_result)) foo(void)
> {
> return NULL;
> }
>
> int main (void)
> {
> if (0)
> foo();
> return 0;
> }
>
> even without -Wall triggers the compiler warning just fine. So I can't
> see why the warning is not triggering.
>
> Cheers,
> -Matt
>
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