crypto: mbedtls_shim: Remove incorrect out_len calculation in AEAD decrypt

kaabia · jhedberg · commit 577f60dcd72a · 2025-11-13T12:01:44.000+02:00
Remove erroneous calculation of `apkt-&gt;pkt-&gt;out_len` in
`mtls_ccm_decrypt_auth` and `mtls_gcm_decrypt_auth`.
The output length should be handled by the caller or the
AEAD decryption process itself.

Signed-off-by: Badr Bacem KAABIA &lt;badrbacemkaabia@gmail.com&gt;
diff --git a/drivers/crypto/crypto_mtls_shim.c b/drivers/crypto/crypto_mtls_shim.c
@@ -231,9 +231,6 @@ static int mtls_ccm_decrypt_auth(struct cipher_ctx *ctx,
 		return -EINVAL;
 	}
 
-	apkt->pkt->out_len = apkt->pkt->in_len;
-	apkt->pkt->out_len += ctx->mode_params.ccm_info.tag_len;
-
 	return 0;
 }
 
@@ -290,9 +287,6 @@ static int mtls_gcm_decrypt_auth(struct cipher_ctx *ctx,
 		return -EINVAL;
 	}
 
-	apkt->pkt->out_len = apkt->pkt->in_len;
-	apkt->pkt->out_len += ctx->mode_params.gcm_info.tag_len;
-
 	return 0;
 }
 #endif /* CONFIG_MBEDTLS_CIPHER_GCM_ENABLED */

Original file line number	Diff line number	Diff line change
`@@ -231,9 +231,6 @@ static int mtls_ccm_decrypt_auth(struct cipher_ctx *ctx,`
`231`	`231`	`return -EINVAL;`
`232`	`232`	`}`
`233`	`233`
`234`		`- apkt->pkt->out_len = apkt->pkt->in_len;`
`235`		`- apkt->pkt->out_len += ctx->mode_params.ccm_info.tag_len;`
`236`		`-`
`237`	`234`	`return 0;`
`238`	`235`	`}`
`239`	`236`
`@@ -290,9 +287,6 @@ static int mtls_gcm_decrypt_auth(struct cipher_ctx *ctx,`
`290`	`287`	`return -EINVAL;`
`291`	`288`	`}`
`292`	`289`
`293`		`- apkt->pkt->out_len = apkt->pkt->in_len;`
`294`		`- apkt->pkt->out_len += ctx->mode_params.gcm_info.tag_len;`
`295`		`-`
`296`	`290`	`return 0;`
`297`	`291`	`}`
`298`	`292`	`#endif /* CONFIG_MBEDTLS_CIPHER_GCM_ENABLED */`