From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1F4E2171A1 for ; Mon, 22 May 2023 19:16:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9C895C433EF; Mon, 22 May 2023 19:16:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684782970; bh=V+SRqTeOIQkCJr1YG3oqjich7N1hefNlgQc35gKG3p0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p90fB+ZoLcxjvO5Hr7jSiocH8nS//hdj1di6LjC5/S03h9D4z2ag7NLeNWHIwGCfZ 4aSGzqbnOEvuQkZ9Ddg7F2ZBGtRGBDmq/33bEOCVj3zv9csq0SBvdtmUBtWaYk0Vg+ dv5zKXa59mnq/SCvyHLF+tkW1fONrCqi4LeW2w7w= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Hao Zeng , Steven Rostedt , Sasha Levin Subject: [PATCH 5.15 087/203] recordmcount: Fix memory leaks in the uwrite function Date: Mon, 22 May 2023 20:08:31 +0100 Message-Id: <20230522190357.397329178@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230522190354.935300867@linuxfoundation.org> References: <20230522190354.935300867@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Hao Zeng [ Upstream commit fa359d068574d29e7d2f0fdd0ebe4c6a12b5cfb9 ] Common realloc mistake: 'file_append' nulled but not freed upon failure Link: https://lkml.kernel.org/r/20230426010527.703093-1-zenghao@kylinos.cn Signed-off-by: Hao Zeng Suggested-by: Steven Rostedt Signed-off-by: Steven Rostedt (Google) Signed-off-by: Sasha Levin --- scripts/recordmcount.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c index cce12e1971d85..ec692af8ce9eb 100644 --- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -102,6 +102,7 @@ static ssize_t uwrite(void const *const buf, size_t const count) { size_t cnt = count; off_t idx = 0; + void *p = NULL; file_updated = 1; @@ -109,7 +110,10 @@ static ssize_t uwrite(void const *const buf, size_t const count) off_t aoffset = (file_ptr + count) - file_end; if (aoffset > file_append_size) { - file_append = realloc(file_append, aoffset); + p = realloc(file_append, aoffset); + if (!p) + free(file_append); + file_append = p; file_append_size = aoffset; } if (!file_append) { -- 2.39.2