From: Siddhesh Poyarekar <siddhesh@gotplt.org>
To: Florian Weimer <fweimer@redhat.com>, libc-alpha@sourceware.org
Subject: Re: [PATCH 2/4] nscd: Do not send missing not-found response in addgetnetgrentX (bug 31678)
Date: Wed, 24 Apr 2024 12:35:10 -0400 [thread overview]
Message-ID: <8e697555-e6cd-43a0-94f4-33343dab27d8@gotplt.org> (raw)
In-Reply-To: <90f1fccc39a22663a5c57c4e7c938480ada61d87.1713974801.git.fweimer@redhat.com>
On 2024-04-24 12:08, Florian Weimer wrote:
> If we failed to add a not-found response to the cache, the dataset
> point can be null, resulting in a null pointer dereference.
> ---
LGTM.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
> nscd/netgroupcache.c | 14 ++++++--------
> 1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
> index 24fbac7668..8709fb77b6 100644
> --- a/nscd/netgroupcache.c
> +++ b/nscd/netgroupcache.c
> @@ -147,7 +147,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
> /* No such service. */
> cacheable = do_notfound (db, fd, req, key, &dataset, &total, &timeout,
> &key_copy);
> - goto writeout;
> + goto maybe_cache_add;
> }
>
> memset (&data, '\0', sizeof (data));
> @@ -348,7 +348,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
> {
> cacheable = do_notfound (db, fd, req, key, &dataset, &total, &timeout,
> &key_copy);
> - goto writeout;
> + goto maybe_cache_add;
> }
>
> total = buffilled;
> @@ -410,14 +410,12 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
> }
>
> if (he == NULL && fd != -1)
> - {
> - /* We write the dataset before inserting it to the database
> - since while inserting this thread might block and so would
> - unnecessarily let the receiver wait. */
> - writeout:
> + /* We write the dataset before inserting it to the database since
> + while inserting this thread might block and so would
> + unnecessarily let the receiver wait. */
> writeall (fd, &dataset->resp, dataset->head.recsize);
> - }
>
> + maybe_cache_add:
> if (cacheable)
> {
> /* If necessary, we also propagate the data to disk. */
next prev parent reply other threads:[~2024-04-24 16:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-24 16:08 [PATCH 0/4] Various nscd security fixes Florian Weimer
2024-04-24 16:08 ` [PATCH 1/4] nscd: Stack-based buffer overflow in netgroup cache (bug 31677) Florian Weimer
2024-04-24 16:27 ` Siddhesh Poyarekar
2024-04-24 16:08 ` [PATCH 2/4] nscd: Do not send missing not-found response in addgetnetgrentX (bug 31678) Florian Weimer
2024-04-24 16:35 ` Siddhesh Poyarekar [this message]
2024-04-24 16:08 ` [PATCH 3/4] nscd: Avoid null pointer crashes after notfound response " Florian Weimer
2024-04-24 16:39 ` Siddhesh Poyarekar
2024-04-24 16:08 ` [PATCH 4/4] nscd: netgroup: Use two buffers in addgetnetgrentX (bug 31680) Florian Weimer
2024-04-24 16:48 ` Siddhesh Poyarekar
2024-04-24 20:53 ` [PATCH 0/4] Various nscd security fixes Carlos O'Donell
2024-04-26 0:10 ` Cristian Rodríguez
2024-04-26 8:10 ` Florian Weimer
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