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[v4] crypto: Use struct_size() helper with kmalloc()

Message ID 20220519011918.173538-1-guozihua@huawei.com (mailing list archive)
State New
Headers show
Series [v4] crypto: Use struct_size() helper with kmalloc() | expand

Commit Message

GUO Zihua May 19, 2022, 1:19 a.m. UTC
Make use of struct_size() helper for structures containing flexible array
member instead of sizeof() which prevents potential issues, as well as
increase readability.

Reference: https://lore.kernel.org/all/CAHk-=wiGWjxs7EVUpccZEi6esvjpHJdgHQ=vtUeJ5crL62hx9A@mail.gmail.com/

Signed-off-by: GUO Zihua <guozihua@huawei.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>


    Change subject from "in kmalloc" to "with kmalloc" following David's
suggestion. Added Kees' review-by.
    Update commit message according to Gustavo's review.
    Use size_add() helper following Kees Cook's suggestion.
 crypto/asymmetric_keys/asymmetric_type.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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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)),
 	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),
 	if (!match_id)
 		return ERR_PTR(-ENOMEM);