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commit cf2e0082ce88fc2c75479c26a4b9f69f1b028c80
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Author: Steve Dickson <steved@redhat.com>
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Date: Thu May 29 09:40:59 2014 -0400
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Avoid buffer overruns by allocating buffer in svcauth_gss_validate()
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Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
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Signed-off-by: Steve Dickson <steved@redhat.com>
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diff --git a/src/svc_auth_gss.c b/src/svc_auth_gss.c
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index 601a691..26c1065 100644
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--- a/src/svc_auth_gss.c
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+++ b/src/svc_auth_gss.c
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@@ -286,21 +286,19 @@ svcauth_gss_validate(struct svc_rpc_gss_data *gd, struct rpc_msg *msg)
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struct opaque_auth *oa;
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gss_buffer_desc rpcbuf, checksum;
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OM_uint32 maj_stat, min_stat, qop_state;
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- u_char rpchdr[128];
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+ u_char *rpchdr;
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int32_t *buf;
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gss_log_debug("in svcauth_gss_validate()");
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- memset(rpchdr, 0, sizeof(rpchdr));
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-
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/* XXX - Reconstruct RPC header for signing (from xdr_callmsg). */
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oa = &msg->rm_call.cb_cred;
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if (oa->oa_length > MAX_AUTH_BYTES)
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return (FALSE);
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-
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- /* 8 XDR units from the IXDR macro calls. */
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- if (sizeof(rpchdr) < (8 * BYTES_PER_XDR_UNIT +
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- RNDUP(oa->oa_length)))
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+
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+ rpchdr = (u_char *)calloc(((8 * BYTES_PER_XDR_UNIT) +
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+ RNDUP(oa->oa_length)), 1);
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+ if (rpchdr == NULL)
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return (FALSE);
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buf = (int32_t *)rpchdr;
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@@ -325,6 +323,8 @@ svcauth_gss_validate(struct svc_rpc_gss_data *gd, struct rpc_msg *msg)
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maj_stat = gss_verify_mic(&min_stat, gd->ctx, &rpcbuf, &checksum,
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&qop_state);
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+ free(rpchdr);
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+
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if (maj_stat != GSS_S_COMPLETE) {
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gss_log_status("gss_verify_mic", maj_stat, min_stat);
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return (FALSE);
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