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Mon, 3 Oct 2022 17:07:19 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH] nscd: Drop local address tuple variable [BZ #29607] Date: Mon, 3 Oct 2022 20:06:57 -0400 Message-Id: <20221004000657.1940145-1-siddhesh@sourceware.org> X-Mailer: git-send-email 2.37.2 MIME-Version: 1.0 X-Spam-Status: No, score=-1173.2 required=5.0 tests=BAYES_00, GIT_PATCH_0, KAM_DMARC_NONE, KAM_DMARC_STATUS, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_SOFTFAIL, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Siddhesh Poyarekar via Libc-alpha From: Siddhesh Poyarekar Reply-To: Siddhesh Poyarekar Cc: =?utf-8?q?Holger_Hoffst=C3=A4tte?= Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" When a request needs to be resent (e.g. due to insufficient buffer space), the references to subsequent tuples in the local variable are stale and should not be used. This used to work by accident before, but since 1d495912a it no longer does. Instead of trying to reset it, just let gethostbyname4_r write into TUMPBUF6 for us, thus maintaining a consistent state at all times. This is now consistent with what is done in gaih_inet for getaddrinfo. Resolves: BZ #29607 Reported-by: Holger Hoffstätte Tested-by: Holger Hoffstätte Reviewed-by: Carlos O'Donell --- Tested on x86_64 with Fedora and nscd enabled. Testing with other distributions would be really appreciated! Thanks, Sid nscd/aicache.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/nscd/aicache.c b/nscd/aicache.c index 51e793199f..e0baed170b 100644 --- a/nscd/aicache.c +++ b/nscd/aicache.c @@ -110,11 +110,10 @@ addhstaiX (struct database_dyn *db, int fd, request_header *req, "gethostbyname4_r"); if (fct4 != NULL) { - struct gaih_addrtuple atmem; struct gaih_addrtuple *at; while (1) { - at = &atmem; + at = NULL; rc6 = 0; herrno = 0; status[1] = DL_CALL_FCT (fct4, (key, &at, @@ -137,7 +136,7 @@ addhstaiX (struct database_dyn *db, int fd, request_header *req, goto next_nip; /* We found the data. Count the addresses and the size. */ - for (const struct gaih_addrtuple *at2 = at = &atmem; at2 != NULL; + for (const struct gaih_addrtuple *at2 = at; at2 != NULL; at2 = at2->next) { ++naddrs;