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drm/ast: potential dereference of null pointer
author
Jiasheng Jiang
<jiasheng@iscas.ac.cn>
Tue, 14 Dec 2021 01:41:26 +0000
(09:41 +0800)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Wed, 22 Dec 2021 08:32:41 +0000
(09:32 +0100)
[ Upstream commit
fea3fdf975dd9f3e5248afaab8fe023db313f005
]
The return value of kzalloc() needs to be checked.
To avoid use of null pointer '&ast_state->base' in case of the
failure of alloc.
Fixes:
f0adbc382b8b
("drm/ast: Allocate initial CRTC state of the correct size")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link:
https://patchwork.freedesktop.org/patch/msgid/20211214014126.2211535-1-jiasheng@iscas.ac.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/gpu/drm/ast/ast_mode.c
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diff --git
a/drivers/gpu/drm/ast/ast_mode.c
b/drivers/gpu/drm/ast/ast_mode.c
index
1e30eae
..
d5c98f7
100644
(file)
--- a/
drivers/gpu/drm/ast/ast_mode.c
+++ b/
drivers/gpu/drm/ast/ast_mode.c
@@
-1121,7
+1121,10
@@
static void ast_crtc_reset(struct drm_crtc *crtc)
if (crtc->state)
crtc->funcs->atomic_destroy_state(crtc, crtc->state);
- __drm_atomic_helper_crtc_reset(crtc, &ast_state->base);
+ if (ast_state)
+ __drm_atomic_helper_crtc_reset(crtc, &ast_state->base);
+ else
+ __drm_atomic_helper_crtc_reset(crtc, NULL);
}
static struct drm_crtc_state *