crypto - Avoid free() namespace collision

gcc-10 complains about using the name of a standard library
function in the kernel, as we are not building with -ffreestanding:

crypto/xts.c:325:13: error: conflicting types for built-in function 'free'; expected 'void(void *)' [-Werror=builtin-declaration-mismatch]
  325 | static void free(struct skcipher_instance *inst)
      |             ^~~~
crypto/lrw.c:290:13: error: conflicting types for built-in function 'free'; expected 'void(void *)' [-Werror=builtin-declaration-mismatch]
  290 | static void free(struct skcipher_instance *inst)
      |             ^~~~
crypto/lrw.c:27:1: note: 'free' is declared in header '<stdlib.h>'

The xts and lrw cipher implementations run into this because they do
not use the conventional namespaced function names.

It might be better to rename all local functions in those files to
help with things like 'ctags' and 'grep', but just renaming these two
avoids the build issue. I picked the more verbose crypto_xts_free()
and crypto_lrw_free() names for consistency with several other drivers
that do use namespaced function names.

Fixes: f1c131b45410 ("crypto: xts - Convert to skcipher")
Fixes: 700cb3f5fe75 ("crypto: lrw - Convert to skcipher")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/lrw.c b/crypto/lrw.c
index 376d7ed3f1f8715d0da884425fabcf41b74149a9..5b07a7c09296690a7195822acaaaa332d69ca430 100644 (file)
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -287,7 +287,7 @@ static void exit_tfm(struct crypto_skcipher *tfm)
        crypto_free_skcipher(ctx->child);
 }
 
-static void free(struct skcipher_instance *inst)
+static void crypto_lrw_free(struct skcipher_instance *inst)
 {
        crypto_drop_skcipher(skcipher_instance_ctx(inst));
        kfree(inst);
@@ -400,12 +400,12 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
        inst->alg.encrypt = encrypt;
        inst->alg.decrypt = decrypt;
 
-       inst->free = free;
+       inst->free = crypto_lrw_free;
 
        err = skcipher_register_instance(tmpl, inst);
        if (err) {
 err_free_inst:
-               free(inst);
+               crypto_lrw_free(inst);
        }
        return err;
 }

diff --git a/crypto/xts.c b/crypto/xts.c
index dbdd8af629e6963fd4b8de6d9b15d26fa5232ee9..3565f3b863a61c70a868bb01b683555b0db203eb 100644 (file)
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -322,7 +322,7 @@ static void exit_tfm(struct crypto_skcipher *tfm)
        crypto_free_cipher(ctx->tweak);
 }
 
-static void free(struct skcipher_instance *inst)
+static void crypto_xts_free(struct skcipher_instance *inst)
 {
        crypto_drop_skcipher(skcipher_instance_ctx(inst));
        kfree(inst);
@@ -434,12 +434,12 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
        inst->alg.encrypt = encrypt;
        inst->alg.decrypt = decrypt;
 
-       inst->free = free;
+       inst->free = crypto_xts_free;
 
        err = skcipher_register_instance(tmpl, inst);
        if (err) {
 err_free_inst:
-               free(inst);
+               crypto_xts_free(inst);
        }
        return err;
 }