From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Date: Tue, 10 Dec 2019 22:02:51 +0000 Subject: [PATCH AUTOSEL 4.14 120/130] fbtft: Make sure string is NULL terminated Message-Id: <20191210220301.13262-120-sashal@kernel.org> List-Id: References: <20191210220301.13262-1-sashal@kernel.org> In-Reply-To: <20191210220301.13262-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sasha Levin , devel@driverdev.osuosl.org, linux-fbdev@vger.kernel.org, Greg Kroah-Hartman , dri-devel@lists.freedesktop.org, Andy Shevchenko From: Andy Shevchenko [ Upstream commit 21f585480deb4bcf0d92b08879c35d066dfee030 ] New GCC warns about inappropriate use of strncpy(): drivers/staging/fbtft/fbtft-core.c: In function ‘fbtft_framebuffer_alloc’: drivers/staging/fbtft/fbtft-core.c:665:2: warning: ‘strncpy’ specified bound 16 equals destination size [-Wstringop-truncation] 665 | strncpy(info->fix.id, dev->driver->name, 16); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Later on the copy is being used with the assumption to be NULL terminated. Make sure string is NULL terminated by switching to snprintf(). Signed-off-by: Andy Shevchenko Link: https://lore.kernel.org/r/20191120095716.26628-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/staging/fbtft/fbtft-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c index 0cbcbad8f0742..b81c6dfa5b249 100644 --- a/drivers/staging/fbtft/fbtft-core.c +++ b/drivers/staging/fbtft/fbtft-core.c @@ -780,7 +780,7 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display, fbdefio->deferred_io = fbtft_deferred_io; fb_deferred_io_init(info); - strncpy(info->fix.id, dev->driver->name, 16); + snprintf(info->fix.id, sizeof(info->fix.id), "%s", dev->driver->name); info->fix.type = FB_TYPE_PACKED_PIXELS; info->fix.visual = FB_VISUAL_TRUECOLOR; info->fix.xpanstep = 0; -- 2.20.1