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commit 7835b00dbce53c3c87bbbb1754a95fb5e58187aa
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Apr 25 15:01:07 2024 +0200
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CVE-2024-33600: nscd: Do not send missing not-found response in addgetnetgrentX (bug 31678)
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If we failed to add a not-found response to the cache, the dataset
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point can be null, resulting in a null pointer dereference.
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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
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index 0a9d864109cdd8cd..d53c473c3e5139b8 100644
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--- a/nscd/netgroupcache.c
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+++ b/nscd/netgroupcache.c
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@@ -148,7 +148,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
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/* No such service. */
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cacheable = do_notfound (db, fd, req, key, &dataset, &total, &timeout,
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&key_copy);
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- goto writeout;
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+ goto maybe_cache_add;
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}
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memset (&data, '\0', sizeof (data));
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@@ -349,7 +349,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
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{
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cacheable = do_notfound (db, fd, req, key, &dataset, &total, &timeout,
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&key_copy);
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- goto writeout;
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+ goto maybe_cache_add;
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}
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total = buffilled;
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@@ -411,14 +411,12 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
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}
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if (he == NULL && fd != -1)
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- {
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- /* We write the dataset before inserting it to the database
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- since while inserting this thread might block and so would
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- unnecessarily let the receiver wait. */
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- writeout:
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+ /* We write the dataset before inserting it to the database since
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+ while inserting this thread might block and so would
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+ unnecessarily let the receiver wait. */
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writeall (fd, &dataset->resp, dataset->head.recsize);
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- }
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+ maybe_cache_add:
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if (cacheable)
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{
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/* If necessary, we also propagate the data to disk. */
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