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authorChristophe JAILLET <christophe.jaillet@wanadoo.fr>2022-02-09 09:03:11 +0300
committerLyude Paul <lyude@redhat.com>2022-05-07 00:35:00 +0300
commitab244be47a8f111bc82496a8a20c907236e37f95 (patch)
treee6339ca49a9acf1eca01c40b0f8bbb00c8bd73cf /drivers/gpu
parent87fd2b091fb33871a7f812658a0971e8e26f903f (diff)
downloadlinux-ab244be47a8f111bc82496a8a20c907236e37f95.tar.xz
drm/nouveau: Fix a potential theorical leak in nouveau_get_backlight_name()
If successful ida_simple_get() calls are not undone when needed, some additional memory may be allocated and wasted. Here, an ID between 0 and MAX_INT is required. If this ID is >=100, it is not taken into account and is wasted. It should be released. Instead of calling ida_simple_remove(), take advantage of the 'max' parameter to require the ID not to be too big. Should it be too big, it is not allocated and don't need to be freed. While at it, use ida_alloc_xxx()/ida_free() instead to ida_simple_get()/ida_simple_remove(). The latter is deprecated and more verbose. Fixes: db1a0ae21461 ("drm/nouveau/bl: Assign different names to interfaces") Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Reviewed-by: Lyude Paul <lyude@redhat.com> [Fixed formatting warning from checkpatch] Signed-off-by: Lyude Paul <lyude@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/9ba85bca59df6813dc029e743a836451d5173221.1644386541.git.christophe.jaillet@wanadoo.fr
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_backlight.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c
index daf9f87477ba..a2141d3d9b1d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -46,8 +46,9 @@ static bool
nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE],
struct nouveau_backlight *bl)
{
- const int nb = ida_simple_get(&bl_ida, 0, 0, GFP_KERNEL);
- if (nb < 0 || nb >= 100)
+ const int nb = ida_alloc_max(&bl_ida, 99, GFP_KERNEL);
+
+ if (nb < 0)
return false;
if (nb > 0)
snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
@@ -414,7 +415,7 @@ nouveau_backlight_init(struct drm_connector *connector)
nv_encoder, ops, &props);
if (IS_ERR(bl->dev)) {
if (bl->id >= 0)
- ida_simple_remove(&bl_ida, bl->id);
+ ida_free(&bl_ida, bl->id);
ret = PTR_ERR(bl->dev);
goto fail_alloc;
}
@@ -442,7 +443,7 @@ nouveau_backlight_fini(struct drm_connector *connector)
return;
if (bl->id >= 0)
- ida_simple_remove(&bl_ida, bl->id);
+ ida_free(&bl_ida, bl->id);
backlight_device_unregister(bl->dev);
nv_conn->backlight = NULL;