[PATCH] crypto: ccree - Silence gcc format-truncation false positive warnings

[PATCH] crypto: ccree - Silence gcc format-truncation false positive warnings

[Herbert Xu]

The heuristics used by gcc triggers false positive truncation
warnings in hifn_alg_alloc.  The warning triggered by the strings
here are clearly false positives (see
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95755).

Add checks on snprintf calls to silence these warnings, including
the one for cra_driver_name even though it does not currently trigger
a gcc warning.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/ccree/cc_aead.c b/drivers/crypto/ccree/cc_aead.c
index 109ffb375fc6..5ef39d682389 100644
--- a/drivers/crypto/ccree/cc_aead.c
+++ b/drivers/crypto/ccree/cc_aead.c
@@ -2569,9 +2569,13 @@ static struct cc_crypto_alg *cc_create_aead_alg(struct cc_alg_template *tmpl,
 
 	alg = &tmpl->template_aead;
 
-	snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", tmpl->name);
-	snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
-		 tmpl->driver_name);
+	if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s",
+		     tmpl->name) >= CRYPTO_MAX_ALG_NAME)
+		return ERR_PTR(-EINVAL);
+	if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+		     tmpl->driver_name) >= CRYPTO_MAX_ALG_NAME)
+		return ERR_PTR(-EINVAL);
+
 	alg->base.cra_module = THIS_MODULE;
 	alg->base.cra_priority = CC_CRA_PRIO;
 
diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c
index 2cd44d7457a4..d229e54fa935 100644
--- a/drivers/crypto/ccree/cc_cipher.c
+++ b/drivers/crypto/ccree/cc_cipher.c
@@ -1427,9 +1427,13 @@ static struct cc_crypto_alg *cc_create_alg(const struct cc_alg_template *tmpl,
 
 	memcpy(alg, &tmpl->template_skcipher, sizeof(*alg));
 
-	snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", tmpl->name);
-	snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
-		 tmpl->driver_name);
+	if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s",
+		     tmpl->name) >= CRYPTO_MAX_ALG_NAME)
+		return ERR_PTR(-EINVAL);
+	if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+		     tmpl->driver_name) >= CRYPTO_MAX_ALG_NAME)
+		return ERR_PTR(-EINVAL);
+
 	alg->base.cra_module = THIS_MODULE;
 	alg->base.cra_priority = CC_CRA_PRIO;
 	alg->base.cra_blocksize = tmpl->blocksize;
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt