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[71.206.142.238]) by smtp.gmail.com with ESMTPSA id p127-20020a0dcd85000000b00568ebae9162sm694695ywd.144.2023.06.20.14.40.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Jun 2023 14:40:34 -0700 (PDT) From: Joe Simmons-Talbott To: libc-alpha@sourceware.org Cc: Joe Simmons-Talbott Subject: [PATCH] getaddrinfo: Get rid of alloca Date: Tue, 20 Jun 2023 17:40:31 -0400 Message-Id: <20230620214031.1241057-1-josimmon@redhat.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII"; x-default=true X-Spam-Status: No, score=-12.5 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Use a scratch_buffer rather than alloca to avoid potential stack overflow. --- sysdeps/posix/getaddrinfo.c | 22 ++++++++-------------- 1 file changed, 8 insertions(+), 14 deletions(-) diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c index 0356b622be..442475d621 100644 --- a/sysdeps/posix/getaddrinfo.c +++ b/sysdeps/posix/getaddrinfo.c @@ -2404,22 +2404,17 @@ getaddrinfo (const char *name, const char *service, struct addrinfo *q; struct addrinfo *last = NULL; char *canonname = NULL; - bool malloc_results; size_t alloc_size = nresults * (sizeof (*results) + sizeof (size_t)); + struct scratch_buffer buf; + scratch_buffer_init (&buf); - malloc_results - = !__libc_use_alloca (alloc_size); - if (malloc_results) + if (!scratch_buffer_set_array_size (&buf, 1, alloc_size)) { - results = malloc (alloc_size); - if (results == NULL) - { - __free_in6ai (in6ai); - return EAI_MEMORY; - } + __free_in6ai (in6ai); + return EAI_MEMORY; } - else - results = alloca (alloc_size); + results = buf.data; + order = (size_t *) (results + nresults); /* Now we definitely need the interface information. */ @@ -2590,8 +2585,7 @@ getaddrinfo (const char *name, const char *service, /* Fill in the canonical name into the new first entry. */ p->ai_canonname = canonname; - if (malloc_results) - free (results); + scratch_buffer_free (&buf); } __free_in6ai (in6ai); -- 2.39.2