6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: T.J. Mercier <tjmercier@xxxxxxxxxx>
commit 8c7c44be57672e1474bf15a451011c291e85fda4 upstream.
A syncobj reference is taken in drm_syncobj_find, but not released if
eventfd_ctx_fdget or kzalloc fails. Put the reference in these error
paths.
Reported-by: Xingyu Jin <xingyuj@xxxxxxxxxx>
Fixes: c7a472297169 ("drm/syncobj: add IOCTL to register an eventfd")
Signed-off-by: T.J. Mercier <tjmercier@xxxxxxxxxx>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxx>
Reviewed-by. Christian König <christian.koenig@xxxxxxx>
CC: stable@xxxxxxxxxxxxxxx # 6.6+
Link: https://patchwork.freedesktop.org/patch/msgid/20240909205400.3498337-1-tjmercier@xxxxxxxxxx
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_syncobj.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -1421,6 +1421,7 @@ drm_syncobj_eventfd_ioctl(struct drm_dev
struct drm_syncobj *syncobj;
struct eventfd_ctx *ev_fd_ctx;
struct syncobj_eventfd_entry *entry;
+ int ret;
if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
return -EOPNOTSUPP;
@@ -1436,13 +1437,15 @@ drm_syncobj_eventfd_ioctl(struct drm_dev
return -ENOENT;
ev_fd_ctx = eventfd_ctx_fdget(args->fd);
- if (IS_ERR(ev_fd_ctx))
- return PTR_ERR(ev_fd_ctx);
+ if (IS_ERR(ev_fd_ctx)) {
+ ret = PTR_ERR(ev_fd_ctx);
+ goto err_fdget;
+ }
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry) {
- eventfd_ctx_put(ev_fd_ctx);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto err_kzalloc;
}
entry->syncobj = syncobj;
entry->ev_fd_ctx = ev_fd_ctx;
@@ -1453,6 +1456,12 @@ drm_syncobj_eventfd_ioctl(struct drm_dev
drm_syncobj_put(syncobj);
return 0;
+
+err_kzalloc:
+ eventfd_ctx_put(ev_fd_ctx);
+err_fdget:
+ drm_syncobj_put(syncobj);
+ return ret;
}
int
