From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BB8EE3B9930; Tue, 21 Jul 2026 22:10:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671836; cv=none; b=jHal5VV1l/KYSO2Vf2CM4LBDkRt5ks6ALJF5wnt/KaUFSYv9GQgH9+7Tma58N6p8XFy7Qt/1l52sw7KV2Q5TAJkjXxACyWOu6R87oYRfwewrv5uVhdLW0WFSCkid3Fcvomtx6tiRIAnEJW4TMJNBM/Zo9hWJ2+cyeXJGFfOQ0aE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671836; c=relaxed/simple; bh=tTNf4w7DcCeCUKDYqeFLNXKnGkJyNLgeOHPlBjPzAIw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=no7HGwPR0yfEXtssmY++4eIc4EIKe8rv66DrB0dbtMJT8nEpxAyaGynTD+hgRFdx98oX5wiAUiBYEE+qdG6dhRlTIfBEOF3X1ugBVTI6fkTjtvtJCHqz/G1vu7aNEwHveD+GemKlDMszXAUkX4E2Lvj98tI9mIE0eDuHzlTQc2w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=H0G4jkgI; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="H0G4jkgI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2BF971F000E9; Tue, 21 Jul 2026 22:10:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784671835; bh=mlsgEGhdpCg+6LYJMPaa2EZOmZwxsoFOB+Uu14ayly4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=H0G4jkgII04tw6R0jwySS+dURkuigzTLbyXC6ndnpRDoweixbKwG0YfIFKX1nqCOK TxYVKgU2NNX6gtLs+IlFUrBzkhABqi4GC1Y8OXbLMCcWkqStdDFztsiQsUuEhd+96K pJAEty27B98DQyjEkheIFsNZ8wMdNZrhIDhI35Uk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, sashiko-bot , Alexey Budankov , Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH 5.15 395/843] perf mmap: Fix NULL deref in aio cleanup on alloc failure Date: Tue, 21 Jul 2026 17:20:30 +0200 Message-ID: <20260721152414.926109314@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Arnaldo Carvalho de Melo [ Upstream commit 25627346b10e6a564610ea2c49dc6dd54812226d ] perf_mmap__aio_mmap() sets map->aio.nr_cblocks before allocating the data array. If calloc() for aiocb or cblocks fails before the data array is allocated, the return -1 path leads to perf_mmap__aio_munmap() which loops nr_cblocks times calling perf_mmap__aio_free(). Both versions of perf_mmap__aio_free() (NUMA and non-NUMA) dereference map->aio.data[idx] without checking if data is NULL, causing a NULL pointer dereference. Add NULL checks for map->aio.data at the top of both perf_mmap__aio_free() variants so the cleanup path is safe when allocation fails partway through perf_mmap__aio_mmap(). Fixes: d3d1af6f011a553a ("perf record: Enable asynchronous trace writing") Reported-by: sashiko-bot Cc: Alexey Budankov Assisted-by: Claude:claude-opus-4.6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/mmap.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c index f642018a8926c0..ff637d5ce900e2 100644 --- a/tools/perf/util/mmap.c +++ b/tools/perf/util/mmap.c @@ -88,10 +88,10 @@ static int perf_mmap__aio_alloc(struct mmap *map, int idx) static void perf_mmap__aio_free(struct mmap *map, int idx) { - if (map->aio.data[idx]) { - munmap(map->aio.data[idx], mmap__mmap_len(map)); - map->aio.data[idx] = NULL; - } + if (!map->aio.data || !map->aio.data[idx]) + return; + munmap(map->aio.data[idx], mmap__mmap_len(map)); + map->aio.data[idx] = NULL; } static int perf_mmap__aio_bind(struct mmap *map, int idx, int cpu, int affinity) @@ -140,6 +140,8 @@ static int perf_mmap__aio_alloc(struct mmap *map, int idx) static void perf_mmap__aio_free(struct mmap *map, int idx) { + if (!map->aio.data) + return; zfree(&(map->aio.data[idx])); } -- 2.53.0