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| author |   José Expósito <jose.exposito89@gmail.com> | 2025-02-12 09:49:12 +0100 |
|---|---|---|
| committer |   Louis Chauvet <louis.chauvet@bootlin.com> | 2025-02-13 15:49:45 +0100 |
| commit | ed15511a773df86205bda66c37193569575ae828 (patch) | |
| tree | cb018d340038a34bc37a444e5a31a6650ac1f881 | |
| parent | drm: writeback: Fix use after free in drm_writeback_connector_cleanup() (diff) | |
| download | wireguard-linux-ed15511a773df86205bda66c37193569575ae828.tar.xz wireguard-linux-ed15511a773df86205bda66c37193569575ae828.zip | |
drm/vkms: Fix use after free and double free on init error
If the driver initialization fails, the vkms_exit() function might
access an uninitialized or freed default_config pointer and it might
double free it.
Fix both possible errors by initializing default_config only when the
driver initialization succeeded.
Reported-by: Louis Chauvet <louis.chauvet@bootlin.com>
Closes: https://lore.kernel.org/all/Z5uDHcCmAwiTsGte@louis-chauvet-laptop/
Fixes: 2df7af93fdad ("drm/vkms: Add vkms_config type")
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Reviewed-by: Thomas Zimmermann <tzimmremann@suse.de>
Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250212084912.3196-1-jose.exposito89@gmail.com
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
| -rw-r--r-- | drivers/gpu/drm/vkms/vkms_drv.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c index 7c142bfc3bd9..b6de91134a22 100644 --- a/drivers/gpu/drm/vkms/vkms_drv.c +++ b/drivers/gpu/drm/vkms/vkms_drv.c @@ -235,17 +235,19 @@ static int __init vkms_init(void) if (!config) return -ENOMEM; - default_config = config; - config->cursor = enable_cursor; config->writeback = enable_writeback; config->overlay = enable_overlay; ret = vkms_create(config); - if (ret) + if (ret) { kfree(config); + return ret; + } - return ret; + default_config = config; + + return 0; } static void vkms_destroy(struct vkms_config *config) @@ -269,9 +271,10 @@ static void vkms_destroy(struct vkms_config *config) static void __exit vkms_exit(void) { - if (default_config->dev) - vkms_destroy(default_config); + if (!default_config) + return; + vkms_destroy(default_config); kfree(default_config); } |