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drm/ast: potential dereference of null pointer

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[ 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>
This commit is contained in:
Jiasheng Jiang 2021-12-14 09:41:26 +08:00 committed by Greg Kroah-Hartman
parent cac0fd4b9b
commit 96bc86cac0
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/ast/ast_mode.c
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@ -857,7 +857,10 @@ 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 *