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ipc/sem.c: replace kvmalloc/memset with kvzalloc and use struct_size

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Use kvzalloc() instead of kvmalloc() and memset().

Also, make use of the struct_size() helper instead of the open-coded
version in order to avoid any potential type mistakes.

This code was detected with the help of Coccinelle.

Link: http://lkml.kernel.org/r/20190131214221.GA28930@embeddedor
Signed-off-by: Gustavo A. R. Silva <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Manfred Spraul <[email protected]>
Cc: Kees Cook <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Gustavo A. R. Silva 2019-03-07 16:30:26 -08:00 • committed by Linus Torvalds
commit 4a2ae92993
1 changed files with 1 additions and 5 deletions
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6
ipc/sem.c
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@ -488,18 +488,14 @@ static inline void sem_rmid(struct ipc_namespace *ns, struct sem_array *s)
static struct sem_array *sem_alloc(size_t nsems)
{
struct sem_array *sma;
size_t size;
if (nsems > (INT_MAX - sizeof(*sma)) / sizeof(sma->sems[0]))
return NULL;
size = sizeof(*sma) + nsems * sizeof(sma->sems[0]);
sma = kvmalloc(size, GFP_KERNEL);
sma = kvzalloc(struct_size(sma, sems, nsems), GFP_KERNEL);
if (unlikely(!sma))
return NULL;
memset(sma, 0, size);
return sma;
}