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Thu, 26 Mar 2020 23:25:04 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by hemlock.osuosl.org (Postfix) with ESMTPS id 1769F89349 for ; Thu, 26 Mar 2020 23:25:04 +0000 (UTC) Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 326F320409; Thu, 26 Mar 2020 23:25:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585265104; bh=wFWYOCEeYi8JNpUbNHGo4J10xFJBQ8U2bkq8XIunCpo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mAN1cIpJGEXsoCPIM0/nsWsqDdMwR/1sTIWijnyxBqWjQrSftG6xxYrAs+WZwxYOh h5wgn7Ykd03rbt+QlHS352cdhUWlhQJ4se/y/Y4WCyyU1sAXrbotJKppLzcQPQBpdg X0ZohRZ+Tw47zLzf7A/AZrR2iDwgNAUypcmXw81w= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 07/15] staging: greybus: loopback_test: fix potential path truncation Date: Thu, 26 Mar 2020 19:24:47 -0400 Message-Id: <20200326232455.8029-7-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200326232455.8029-1-sashal@kernel.org> References: <20200326232455.8029-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-BeenThere: driverdev-devel@linuxdriverproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Driver Project Developer List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Greg Kroah-Hartman , devel@driverdev.osuosl.org, Johan Hovold , greybus-dev@lists.linaro.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: driverdev-devel-bounces@linuxdriverproject.org Sender: "devel" From: Johan Hovold [ Upstream commit f16023834863932f95dfad13fac3fc47f77d2f29 ] Newer GCC warns about a possible truncation of a generated sysfs path name as we're concatenating a directory path with a file name and placing the result in a buffer that is half the size of the maximum length of the directory path (which is user controlled). loopback_test.c: In function 'open_poll_files': loopback_test.c:651:31: warning: '%s' directive output may be truncated writing up to 511 bytes into a region of size 255 [-Wformat-truncation=] 651 | snprintf(buf, sizeof(buf), "%s%s", dev->sysfs_entry, "iteration_count"); | ^~ loopback_test.c:651:3: note: 'snprintf' output between 16 and 527 bytes into a destination of size 255 651 | snprintf(buf, sizeof(buf), "%s%s", dev->sysfs_entry, "iteration_count"); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fix this by making sure the buffer is large enough the concatenated strings. Fixes: 6b0658f68786 ("greybus: tools: Add tools directory to greybus repo and add loopback") Fixes: 9250c0ee2626 ("greybus: Loopback_test: use poll instead of inotify") Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20200312110151.22028-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/staging/greybus/tools/loopback_test.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/greybus/tools/loopback_test.c b/drivers/staging/greybus/tools/loopback_test.c index b82e2befe9355..c1c344e7391c3 100644 --- a/drivers/staging/greybus/tools/loopback_test.c +++ b/drivers/staging/greybus/tools/loopback_test.c @@ -645,7 +645,7 @@ int find_loopback_devices(struct loopback_test *t) static int open_poll_files(struct loopback_test *t) { struct loopback_device *dev; - char buf[MAX_STR_LEN]; + char buf[MAX_SYSFS_PATH + MAX_STR_LEN]; char dummy; int fds_idx = 0; int i; -- 2.20.1 _______________________________________________ devel mailing list devel@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel