From: Gustavo A. R. Silva Date: Thu, 31 Jan 2019 00:27:44 +0000 (-0600) Subject: cxgb4: smt: use struct_size() in kvzalloc() X-Git-Tag: v5.1-rc1~178^2~382 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c49f0ce0b692e8018c32f529a718bb41bc934ab3;p=thirdparty%2Flinux.git cxgb4: smt: use struct_size() in kvzalloc() One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; struct boo entry[]; }; instance = kvzalloc(sizeof(struct foo) + count * sizeof(struct boo), GFP_KERNEL); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kvzalloc(struct_size(instance, entry, count), GFP_KERNEL); This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/chelsio/cxgb4/smt.c b/drivers/net/ethernet/chelsio/cxgb4/smt.c index 7b2207a2a130f..eaf1fb74689c4 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/smt.c +++ b/drivers/net/ethernet/chelsio/cxgb4/smt.c @@ -47,8 +47,7 @@ struct smt_data *t4_init_smt(void) smt_size = SMT_SIZE; - s = kvzalloc(sizeof(*s) + smt_size * sizeof(struct smt_entry), - GFP_KERNEL); + s = kvzalloc(struct_size(s, smtab, smt_size), GFP_KERNEL); if (!s) return NULL; s->smt_size = smt_size;