From: Gustavo A. R. Silva Date: Thu, 31 Jan 2019 00:51:48 +0000 (-0600) Subject: ipv4: fib: use struct_size() in kzalloc() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1f533ba6d50d0e7a104d1a2c1e1a28ee0b919a90;p=linux.git ipv4: fib: use struct_size() in kzalloc() 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 = kzalloc(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 = kzalloc(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/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index 5022bc63863ad..8e185b5a2bf6e 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -1072,7 +1072,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg, goto failure; } - fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL); + fi = kzalloc(struct_size(fi, fib_nh, nhs), GFP_KERNEL); if (!fi) goto failure; fi->fib_metrics = ip_fib_metrics_init(fi->fib_net, cfg->fc_mx,