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elfutils/elfutils-0.188-debuginfod-client-lifetime.patch

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commit c424e5f3d24f76e01242d15ba361dc6234706fed
Author: Frank Ch. Eigler <fche@redhat.com>
Date: Thu Nov 3 10:07:31 2022 -0400
debuginfod.cxx: fix coverity-found use-after-release error
The debuginfod_client object lifetime needs more careful handling,
made easier with the defer_dtor<> gadget.
Signed-off-by: Frank Ch. Eigler <fche@redhat.com>
diff --git a/debuginfod/debuginfod.cxx b/debuginfod/debuginfod.cxx
index f46da6ef..02a11477 100644
--- a/debuginfod/debuginfod.cxx
+++ b/debuginfod/debuginfod.cxx
@@ -2249,85 +2249,82 @@ handle_buildid (MHD_Connection* conn,
int fd = -1;
debuginfod_client *client = debuginfod_pool_begin ();
- if (client != NULL)
- {
- debuginfod_set_progressfn (client, & debuginfod_find_progress);
+ if (client == NULL)
+ throw libc_exception(errno, "debuginfod client pool alloc");
+ defer_dtor<debuginfod_client*,void> client_closer (client, debuginfod_pool_end);
+
+ debuginfod_set_progressfn (client, & debuginfod_find_progress);
- if (conn)
- {
- // Transcribe incoming User-Agent:
- string ua = MHD_lookup_connection_value (conn, MHD_HEADER_KIND, "User-Agent") ?: "";
- string ua_complete = string("User-Agent: ") + ua;
- debuginfod_add_http_header (client, ua_complete.c_str());
-
- // Compute larger XFF:, for avoiding info loss during
- // federation, and for future cyclicity detection.
- string xff = MHD_lookup_connection_value (conn, MHD_HEADER_KIND, "X-Forwarded-For") ?: "";
- if (xff != "")
- xff += string(", "); // comma separated list
-
- unsigned int xff_count = 0;
- for (auto&& i : xff){
- if (i == ',') xff_count++;
- }
+ if (conn)
+ {
+ // Transcribe incoming User-Agent:
+ string ua = MHD_lookup_connection_value (conn, MHD_HEADER_KIND, "User-Agent") ?: "";
+ string ua_complete = string("User-Agent: ") + ua;
+ debuginfod_add_http_header (client, ua_complete.c_str());
+
+ // Compute larger XFF:, for avoiding info loss during
+ // federation, and for future cyclicity detection.
+ string xff = MHD_lookup_connection_value (conn, MHD_HEADER_KIND, "X-Forwarded-For") ?: "";
+ if (xff != "")
+ xff += string(", "); // comma separated list
+
+ unsigned int xff_count = 0;
+ for (auto&& i : xff){
+ if (i == ',') xff_count++;
+ }
- // if X-Forwarded-For: exceeds N hops,
- // do not delegate a local lookup miss to upstream debuginfods.
- if (xff_count >= forwarded_ttl_limit)
- throw reportable_exception(MHD_HTTP_NOT_FOUND, "not found, --forwared-ttl-limit reached \
+ // if X-Forwarded-For: exceeds N hops,
+ // do not delegate a local lookup miss to upstream debuginfods.
+ if (xff_count >= forwarded_ttl_limit)
+ throw reportable_exception(MHD_HTTP_NOT_FOUND, "not found, --forwared-ttl-limit reached \
and will not query the upstream servers");
- // Compute the client's numeric IP address only - so can't merge with conninfo()
- const union MHD_ConnectionInfo *u = MHD_get_connection_info (conn,
- MHD_CONNECTION_INFO_CLIENT_ADDRESS);
- struct sockaddr *so = u ? u->client_addr : 0;
- char hostname[256] = ""; // RFC1035
- if (so && so->sa_family == AF_INET) {
- (void) getnameinfo (so, sizeof (struct sockaddr_in), hostname, sizeof (hostname), NULL, 0,
- NI_NUMERICHOST);
- } else if (so && so->sa_family == AF_INET6) {
- struct sockaddr_in6* addr6 = (struct sockaddr_in6*) so;
- if (IN6_IS_ADDR_V4MAPPED(&addr6->sin6_addr)) {
- struct sockaddr_in addr4;
- memset (&addr4, 0, sizeof(addr4));
- addr4.sin_family = AF_INET;
- addr4.sin_port = addr6->sin6_port;
- memcpy (&addr4.sin_addr.s_addr, addr6->sin6_addr.s6_addr+12, sizeof(addr4.sin_addr.s_addr));
- (void) getnameinfo ((struct sockaddr*) &addr4, sizeof (addr4),
- hostname, sizeof (hostname), NULL, 0,
- NI_NUMERICHOST);
- } else {
- (void) getnameinfo (so, sizeof (struct sockaddr_in6), hostname, sizeof (hostname), NULL, 0,
- NI_NUMERICHOST);
- }
- }
-
- string xff_complete = string("X-Forwarded-For: ")+xff+string(hostname);
- debuginfod_add_http_header (client, xff_complete.c_str());
+ // Compute the client's numeric IP address only - so can't merge with conninfo()
+ const union MHD_ConnectionInfo *u = MHD_get_connection_info (conn,
+ MHD_CONNECTION_INFO_CLIENT_ADDRESS);
+ struct sockaddr *so = u ? u->client_addr : 0;
+ char hostname[256] = ""; // RFC1035
+ if (so && so->sa_family == AF_INET) {
+ (void) getnameinfo (so, sizeof (struct sockaddr_in), hostname, sizeof (hostname), NULL, 0,
+ NI_NUMERICHOST);
+ } else if (so && so->sa_family == AF_INET6) {
+ struct sockaddr_in6* addr6 = (struct sockaddr_in6*) so;
+ if (IN6_IS_ADDR_V4MAPPED(&addr6->sin6_addr)) {
+ struct sockaddr_in addr4;
+ memset (&addr4, 0, sizeof(addr4));
+ addr4.sin_family = AF_INET;
+ addr4.sin_port = addr6->sin6_port;
+ memcpy (&addr4.sin_addr.s_addr, addr6->sin6_addr.s6_addr+12, sizeof(addr4.sin_addr.s_addr));
+ (void) getnameinfo ((struct sockaddr*) &addr4, sizeof (addr4),
+ hostname, sizeof (hostname), NULL, 0,
+ NI_NUMERICHOST);
+ } else {
+ (void) getnameinfo (so, sizeof (struct sockaddr_in6), hostname, sizeof (hostname), NULL, 0,
+ NI_NUMERICHOST);
}
-
- if (artifacttype == "debuginfo")
- fd = debuginfod_find_debuginfo (client,
- (const unsigned char*) buildid.c_str(),
- 0, NULL);
- else if (artifacttype == "executable")
- fd = debuginfod_find_executable (client,
- (const unsigned char*) buildid.c_str(),
- 0, NULL);
- else if (artifacttype == "source")
- fd = debuginfod_find_source (client,
- (const unsigned char*) buildid.c_str(),
- 0, suffix.c_str(), NULL);
- else if (artifacttype == "section")
- fd = debuginfod_find_section (client,
- (const unsigned char*) buildid.c_str(),
- 0, section.c_str(), NULL);
-
+ }
+
+ string xff_complete = string("X-Forwarded-For: ")+xff+string(hostname);
+ debuginfod_add_http_header (client, xff_complete.c_str());
}
- else
- fd = -errno; /* Set by debuginfod_begin. */
- debuginfod_pool_end (client);
-
+
+ if (artifacttype == "debuginfo")
+ fd = debuginfod_find_debuginfo (client,
+ (const unsigned char*) buildid.c_str(),
+ 0, NULL);
+ else if (artifacttype == "executable")
+ fd = debuginfod_find_executable (client,
+ (const unsigned char*) buildid.c_str(),
+ 0, NULL);
+ else if (artifacttype == "source")
+ fd = debuginfod_find_source (client,
+ (const unsigned char*) buildid.c_str(),
+ 0, suffix.c_str(), NULL);
+ else if (artifacttype == "section")
+ fd = debuginfod_find_section (client,
+ (const unsigned char*) buildid.c_str(),
+ 0, section.c_str(), NULL);
+
if (fd >= 0)
{
if (conn != 0)
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