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Subject[PATCH 6/6] PKCS#7: Fix the parser cleanup to drain parsed out X.509 certs
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Fix the parser cleanup code to drain parsed out X.509 certs in the case that
the decode fails and we jump to error_decode.

The function is rearranged so that the same cleanup code is used in the success
case as the error case - just that the message descriptor under construction is
only released if it is still pointed to by the context struct at that point.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
---

crypto/asymmetric_keys/pkcs7_parser.c | 39 ++++++++++++++++-----------------
1 file changed, 19 insertions(+), 20 deletions(-)

diff --git a/crypto/asymmetric_keys/pkcs7_parser.c b/crypto/asymmetric_keys/pkcs7_parser.c
index 4c4ea35c338b..1e9861da7ee4 100644
--- a/crypto/asymmetric_keys/pkcs7_parser.c
+++ b/crypto/asymmetric_keys/pkcs7_parser.c
@@ -81,47 +81,46 @@ EXPORT_SYMBOL_GPL(pkcs7_free_message);
struct pkcs7_message *pkcs7_parse_message(const void *data, size_t datalen)
{
struct pkcs7_parse_context *ctx;
- struct pkcs7_message *msg;
- long ret;
+ struct pkcs7_message *msg = ERR_PTR(-ENOMEM);
+ int ret;

- ret = -ENOMEM;
- msg = kzalloc(sizeof(struct pkcs7_message), GFP_KERNEL);
- if (!msg)
- goto error_no_sig;
ctx = kzalloc(sizeof(struct pkcs7_parse_context), GFP_KERNEL);
if (!ctx)
- goto error_no_ctx;
+ goto out_no_ctx;
+ ctx->msg = kzalloc(sizeof(struct pkcs7_message), GFP_KERNEL);
+ if (!ctx->msg)
+ goto out_no_msg;
ctx->sinfo = kzalloc(sizeof(struct pkcs7_signed_info), GFP_KERNEL);
if (!ctx->sinfo)
- goto error_no_sinfo;
+ goto out_no_sinfo;

- ctx->msg = msg;
ctx->data = (unsigned long)data;
ctx->ppcerts = &ctx->certs;
ctx->ppsinfo = &ctx->msg->signed_infos;

/* Attempt to decode the signature */
ret = asn1_ber_decoder(&pkcs7_decoder, ctx, data, datalen);
- if (ret < 0)
- goto error_decode;
+ if (ret < 0) {
+ msg = ERR_PTR(ret);
+ goto out;
+ }
+
+ msg = ctx->msg;
+ ctx->msg = NULL;

+out:
while (ctx->certs) {
struct x509_certificate *cert = ctx->certs;
ctx->certs = cert->next;
x509_free_certificate(cert);
}
pkcs7_free_signed_info(ctx->sinfo);
+out_no_sinfo:
+ pkcs7_free_message(ctx->msg);
+out_no_msg:
kfree(ctx);
+out_no_ctx:
return msg;
-
-error_decode:
- pkcs7_free_signed_info(ctx->sinfo);
-error_no_sinfo:
- kfree(ctx);
-error_no_ctx:
- pkcs7_free_message(msg);
-error_no_sig:
- return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(pkcs7_parse_message);



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