From: Jani Nikula jani.nikula@intel.com
stable inclusion from stable-v6.6.13 commit 7e881af7fb3c2ddc0c29b249250606fbe004f353 bugzilla: https://gitee.com/openeuler/kernel/issues/I99TJK
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 6e455f5dcdd15fa28edf0ffb5b44d3508512dccf ]
Commit 3823119b9c2b ("drm/crtc: Fix uninit-value bug in drm_mode_setcrtc") was supposed to fix use of an uninitialized variable, but introduced another.
num_connectors is only initialized if crtc_req->count_connectors > 0, but it's used regardless. Fix it.
Fixes: 3823119b9c2b ("drm/crtc: Fix uninit-value bug in drm_mode_setcrtc") Cc: syzbot+4fad2e57beb6397ab2fc@syzkaller.appspotmail.com Cc: Ziqi Zhao astrajoan@yahoo.com Cc: Maxime Ripard mripard@kernel.org Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Thomas Zimmermann tzimmermann@suse.de Signed-off-by: Jani Nikula jani.nikula@intel.com Signed-off-by: Maxime Ripard mripard@kernel.org Link: https://patchwork.freedesktop.org/patch/msgid/20231208131238.2924571-1-jani.... Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: ZhangPeng zhangpeng362@huawei.com --- drivers/gpu/drm/drm_crtc.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index d718c17ab1e9..cb90e70d85e8 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -715,7 +715,7 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data, struct drm_mode_set set; uint32_t __user *set_connectors_ptr; struct drm_modeset_acquire_ctx ctx; - int ret, i, num_connectors; + int ret, i, num_connectors = 0;
if (!drm_core_check_feature(dev, DRIVER_MODESET)) return -EOPNOTSUPP; @@ -850,7 +850,6 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data, goto out; }
- num_connectors = 0; for (i = 0; i < crtc_req->count_connectors; i++) { connector_set[i] = NULL; set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;