File glibc-CVE-2024-33600-nscd-Avoid-null-pointer-cr... of Package glibc.35114

Overview Repositories Revisions Requests Users Attributes Meta

File glibc-CVE-2024-33600-nscd-Avoid-null-pointer-crashes-after.patch of Package glibc.35114

From 8d7949183760170c61e55def723c1d8050187874 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Thu, 25 Apr 2024 15:01:07 +0200
Subject: [PATCH] CVE-2024-33600: nscd: Avoid null pointer crashes after
 notfound response (bug 31678)

The addgetnetgrentX call in addinnetgrX may have failed to produce
a result, so the result variable in addinnetgrX can be NULL.
Use db->negtimeout as the fallback value if there is no result data;
the timeout is also overwritten below.

Also avoid sending a second not-found response.  (The client
disconnects after receiving the first response, so the data stream did
not go out of sync even without this fix.)  It is still beneficial to
add the negative response to the mapping, so that the client can get
it from there in the future, instead of going through the socket.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
(cherry picked from commit b048a482f088e53144d26a61c390bed0210f49f2)
---
 nscd/netgroupcache.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index c99cf5791b..e936b698c4 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -512,14 +512,15 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
 
   datahead_init_pos (&dataset->head, sizeof (*dataset) + req->key_len,
 		     sizeof (innetgroup_response_header),
-		     he == NULL ? 0 : dh->nreloads + 1, result->head.ttl);
+		     he == NULL ? 0 : dh->nreloads + 1,
+		     result == NULL ? db->negtimeout : result->head.ttl);
   /* Set the notfound status and timeout based on the result from
      getnetgrent.  */
-  dataset->head.notfound = result->head.notfound;
+  dataset->head.notfound = result == NULL || result->head.notfound;
   dataset->head.timeout = timeout;
 
   dataset->resp.version = NSCD_VERSION;
-  dataset->resp.found = result->resp.found;
+  dataset->resp.found = result != NULL && result->resp.found;
   /* Until we find a matching entry the result is 0.  */
   dataset->resp.result = 0;
 
@@ -567,7 +568,9 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
       goto out;
     }
 
-  if (he == NULL)
+  /* addgetnetgrentX may have already sent a notfound response.  Do
+     not send another one.  */
+  if (he == NULL && dataset->resp.found)
     {
       /* We write the dataset before inserting it to the database
 	 since while inserting this thread might block and so would
-- 
2.45.0

Places

File glibc-CVE-2024-33600-nscd-Avoid-null-pointer-crashes-after.patch of Package glibc.35114

Places