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drm/crtc: fix uninitialized variable use 

[ 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.nikula@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jani Nikula 2023-12-08 15:12:38 +02:00 committed by Greg Kroah-Hartman
parent 809ebacd22
commit 9d588f3b6f
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/drm_crtc.c
View File

@ -715,7 +715,7 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
struct drm_mode_set set; struct drm_mode_set set;
uint32_t __user *set_connectors_ptr; uint32_t __user *set_connectors_ptr;
struct drm_modeset_acquire_ctx ctx; 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)) if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP; return -EOPNOTSUPP;
@ -850,7 +850,6 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
goto out; goto out;
} }
num_connectors = 0;
for (i = 0; i < crtc_req->count_connectors; i++) { for (i = 0; i < crtc_req->count_connectors; i++) {
connector_set[i] = NULL; connector_set[i] = NULL;
set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr; set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;