From: Dingchen Zhang dingchen.zhang@amd.com
[ Upstream commit 72a848f5c46bab4c921edc9cbffd1ab273b2be17 ]
userspace may transfer a newline, and this terminating newline is replaced by a '\0' to avoid followup issues.
'len-1' is the index to replace the newline of CRC source name.
v3: typo fix (Sam)
v2: update patch subject, body and format. (Sam)
Cc: Leo Li sunpeng.li@amd.com Cc: Harry Wentland Harry.Wentland@amd.com Cc: Sam Ravnborg sam@ravnborg.org Signed-off-by: Dingchen Zhang dingchen.zhang@amd.com Reviewed-by: Sam Ravnborg sam@ravnborg.org Signed-off-by: Alex Deucher alexander.deucher@amd.com Link: https://patchwork.freedesktop.org/patch/msgid/20190610134751.14356-1-dingche... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/drm_debugfs_crc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c index ca3c55c6b8155..2ece2957da1af 100644 --- a/drivers/gpu/drm/drm_debugfs_crc.c +++ b/drivers/gpu/drm/drm_debugfs_crc.c @@ -140,8 +140,8 @@ static ssize_t crc_control_write(struct file *file, const char __user *ubuf, if (IS_ERR(source)) return PTR_ERR(source);
- if (source[len] == '\n') - source[len] = '\0'; + if (source[len - 1] == '\n') + source[len - 1] = '\0';
ret = crtc->funcs->verify_crc_source(crtc, source, &values_cnt); if (ret)