From: Jiasheng Jiang <jiasheng@iscas.ac.cn> To: liviu.dudau@arm.com, brian.starkey@arm.com, airlied@linux.ie, daniel@ffwll.ch Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Jiasheng Jiang <jiasheng@iscas.ac.cn> Subject: [PATCH v2] drm: mali-dp: potential dereference of null pointer Date: Tue, 14 Dec 2021 20:51:10 +0800 [thread overview] Message-ID: <20211214125110.46979-1-jiasheng@iscas.ac.cn> (raw) The return value of kzalloc() needs to be checked. To avoid use of null pointer '&state->base' in case of the failure of alloc. Fixes: 99665d072183 ("drm: mali-dp: add malidp_crtc_state struct") Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> Reported-by: Brian Starkey <brian.starkey@arm.com> --- Changelog: v1 -> v2 *Change 1. Add r-p. --- drivers/gpu/drm/arm/malidp_crtc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/arm/malidp_crtc.c b/drivers/gpu/drm/arm/malidp_crtc.c index 494075ddbef6..b5928b52e279 100644 --- a/drivers/gpu/drm/arm/malidp_crtc.c +++ b/drivers/gpu/drm/arm/malidp_crtc.c @@ -487,7 +487,10 @@ static void malidp_crtc_reset(struct drm_crtc *crtc) if (crtc->state) malidp_crtc_destroy_state(crtc, crtc->state); - __drm_atomic_helper_crtc_reset(crtc, &state->base); + if (state) + __drm_atomic_helper_crtc_reset(crtc, &state->base); + else + __drm_atomic_helper_crtc_reset(crtc, NULL); } static int malidp_crtc_enable_vblank(struct drm_crtc *crtc) -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Jiasheng Jiang <jiasheng@iscas.ac.cn> To: liviu.dudau@arm.com, brian.starkey@arm.com, airlied@linux.ie, daniel@ffwll.ch Cc: Jiasheng Jiang <jiasheng@iscas.ac.cn>, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH v2] drm: mali-dp: potential dereference of null pointer Date: Tue, 14 Dec 2021 20:51:10 +0800 [thread overview] Message-ID: <20211214125110.46979-1-jiasheng@iscas.ac.cn> (raw) The return value of kzalloc() needs to be checked. To avoid use of null pointer '&state->base' in case of the failure of alloc. Fixes: 99665d072183 ("drm: mali-dp: add malidp_crtc_state struct") Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> Reported-by: Brian Starkey <brian.starkey@arm.com> --- Changelog: v1 -> v2 *Change 1. Add r-p. --- drivers/gpu/drm/arm/malidp_crtc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/arm/malidp_crtc.c b/drivers/gpu/drm/arm/malidp_crtc.c index 494075ddbef6..b5928b52e279 100644 --- a/drivers/gpu/drm/arm/malidp_crtc.c +++ b/drivers/gpu/drm/arm/malidp_crtc.c @@ -487,7 +487,10 @@ static void malidp_crtc_reset(struct drm_crtc *crtc) if (crtc->state) malidp_crtc_destroy_state(crtc, crtc->state); - __drm_atomic_helper_crtc_reset(crtc, &state->base); + if (state) + __drm_atomic_helper_crtc_reset(crtc, &state->base); + else + __drm_atomic_helper_crtc_reset(crtc, NULL); } static int malidp_crtc_enable_vblank(struct drm_crtc *crtc) -- 2.25.1
next reply other threads:[~2021-12-14 12:51 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-12-14 12:51 Jiasheng Jiang [this message] 2021-12-14 12:51 ` [PATCH v2] drm: mali-dp: potential dereference of null pointer Jiasheng Jiang 2021-12-14 12:54 ` Liviu Dudau 2021-12-14 12:54 ` Liviu Dudau
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