Make use of struct_size() heler for structures containing flexible array member instead of sizeof() which prevents potential issues as well as addressing the following sparse warning: crypto/asymmetric_keys/asymmetric_type.c:155:23: warning: using sizeof on a flexible structure crypto/asymmetric_keys/asymmetric_type.c:247:28: warning: using sizeof on a flexible structure Reference: https://github.com/KSPP/linux/issues/174 Signed-off-by: GUO Zihua <guozihua@xxxxxxxxxx> --- v2: Use size_add() helper following Kees Cook's suggestion. --- crypto/asymmetric_keys/asymmetric_type.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_keys/asymmetric_type.c index 41a2f0eb4ce4..e020222b1fe5 100644 --- a/crypto/asymmetric_keys/asymmetric_type.c +++ b/crypto/asymmetric_keys/asymmetric_type.c @@ -152,7 +152,7 @@ struct asymmetric_key_id *asymmetric_key_generate_id(const void *val_1, { struct asymmetric_key_id *kid; - kid = kmalloc(sizeof(struct asymmetric_key_id) + len_1 + len_2, + kid = kmalloc(struct_size(kid, data, size_add(len_1, len_2)), GFP_KERNEL); if (!kid) return ERR_PTR(-ENOMEM); @@ -244,7 +244,7 @@ struct asymmetric_key_id *asymmetric_key_hex_to_key_id(const char *id) if (asciihexlen & 1) return ERR_PTR(-EINVAL); - match_id = kmalloc(sizeof(struct asymmetric_key_id) + asciihexlen / 2, + match_id = kmalloc(struct_size(match_id, data, asciihexlen / 2), GFP_KERNEL); if (!match_id) return ERR_PTR(-ENOMEM); -- 2.36.0
