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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>
This commit is contained in:
David Howells 2014-09-16 17:29:03 +01:00
parent 3cd0920cde
commit cecf5d2e12
1 changed files with 19 additions and 20 deletions
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39
crypto/asymmetric_keys/pkcs7_parser.c
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@ -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);