From: Chuhong Yuan <hslester96@gmail.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <maxime.ripard@bootlin.com>,
Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>,
Daniel Vetter <daniel@ffwll.ch>,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
Chuhong Yuan <hslester96@gmail.com>
Subject: [PATCH v2] drm/modes: Fix unterminated strncpy
Date: Wed, 31 Jul 2019 10:01:40 +0800 [thread overview]
Message-ID: <20190731020140.3529-1-hslester96@gmail.com> (raw)
strncpy(dest, src, strlen(src)) leads to unterminated
dest, which is dangerous.
Fix it by using strscpy.
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
---
Changes in v2:
- Check whether mode_end + 1 exceeds
the size of mode->name.
drivers/gpu/drm/drm_modes.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 80fcd5dc1558..b0369e690f36 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1770,7 +1770,9 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
}
if (named_mode) {
- strncpy(mode->name, name, mode_end);
+ if (mode_end + 1 > DRM_DISPLAY_MODE_LEN)
+ return false;
+ strscpy(mode->name, name, mode_end + 1);
} else {
ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
parse_extras,
--
2.20.1
reply other threads:[~2019-07-31 2:01 UTC|newest]
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