[glibc/release/2.31/master] CVE-2024-33599: nscd: Stack-based buffer overflow in netgroup cache (bug 31677)

[Florian Weimer]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=69c58d5ef9f584ea198bd00f7964d364d0e6b921

commit 69c58d5ef9f584ea198bd00f7964d364d0e6b921
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Apr 25 15:00:45 2024 +0200

    CVE-2024-33599: nscd: Stack-based buffer overflow in netgroup cache (bug 31677)
    
    Using alloca matches what other caches do.  The request length is
    bounded by MAXKEYLEN.
    
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>
    (cherry picked from commit 87801a8fd06db1d654eea3e4f7626ff476a9bdaa)

Diff:
---
 nscd/netgroupcache.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index 381aa721ef..a833ef039e 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -503,12 +503,13 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
       = (struct indataset *) mempool_alloc (db,
 					    sizeof (*dataset) + req->key_len,
 					    1);
-  struct indataset dataset_mem;
   bool cacheable = true;
   if (__glibc_unlikely (dataset == NULL))
     {
       cacheable = false;
-      dataset = &dataset_mem;
+      /* The alloca is safe because nscd_run_worker verfies that
+	 key_len is not larger than MAXKEYLEN.  */
+      dataset = alloca (sizeof (*dataset) + req->key_len);
     }
 
   datahead_init_pos (&dataset->head, sizeof (*dataset) + req->key_len,