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drm/modes: Fix unterminated strncpy

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strncpy(dest, src, strlen(src)) leads to unterminated
dest, which is dangerous.
Fix it by using strscpy.

Fixes: 3aeeb13d89 ("drm/modes: Support modes names on the command line")
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190731020140.3529-1-hslester96@gmail.com
This commit is contained in:
Chuhong Yuan 2019-07-31 10:01:40 +08:00 committed by Maxime Ripard
parent 5854059457
commit 9b562437d3
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GPG Key ID: E3EF0D6F671851C5
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/drm_modes.c
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@ -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,