drivers/gpu/drm/xlnx/zynqmp_dp_audio.c | 4 ++++ 1 file changed, 4 insertions(+)
devm_kasprintf() calls can return null pointers on failure.
But some return values were not checked in zynqmp_audio_init().
Add NULL check in zynqmp_audio_init(), to handle kernel NULL
pointer dereference error.
Fixes: 3ec5c1579305 ("drm: xlnx: zynqmp_dpsub: Add DP audio support")
Signed-off-by: Charles Han <hanchunchao@inspur.com>
---
drivers/gpu/drm/xlnx/zynqmp_dp_audio.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c b/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c
index fa5f0ace6084..f07ff4eb3a6d 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c
@@ -323,12 +323,16 @@ int zynqmp_audio_init(struct zynqmp_dpsub *dpsub)
audio->dai_name = devm_kasprintf(dev, GFP_KERNEL,
"%s-dai", dev_name(dev));
+ if (!audio->dai_name)
+ return -ENOMEM;
for (unsigned int i = 0; i < ZYNQMP_NUM_PCMS; ++i) {
audio->link_names[i] = devm_kasprintf(dev, GFP_KERNEL,
"%s-dp-%u", dev_name(dev), i);
audio->pcm_names[i] = devm_kasprintf(dev, GFP_KERNEL,
"%s-pcm-%u", dev_name(dev), i);
+ if (!audio->link_names[i] || !audio->pcm_names[i])
+ return -ENOMEM;
}
audio->base = devm_platform_ioremap_resource_byname(pdev, "aud");
--
2.43.0… > Add NULL check in zynqmp_audio_init(), to handle kernel NULL > pointer dereference error. * Can it be more desirable to prevent such issues? * Would the message subject have been nicer with a key word like “PATCH” (besides other refinements)? … > --- > drivers/gpu/drm/xlnx/zynqmp_dp_audio.c | 4 ++++ … Will you become more familiar with patch version descriptions? https://lore.kernel.org/all/?q=%22This+looks+like+a+new+version+of+a+previously+submitted+patch%22 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.14-rc2#n310 Regards, Markus
Thank you for your suggestions. I will read these documents carefully. -----邮件原件----- 发件人: Markus Elfring <Markus.Elfring@web.de> 发送时间: 2025年2月11日 15:56 收件人: Charles Han(韩春超) <hanchunchao@inspur.com>; dri-devel@lists.freedesktop.org; linux-arm-kernel@lists.infradead.org 抄送: LKML <linux-kernel@vger.kernel.org>; David Airlie <airlied@gmail.com>; Laurent Pinchart <laurent.pinchart@ideasonboard.com>; Maarten Lankhorst <maarten.lankhorst@linux.intel.com>; Maxime Ripard <mripard@kernel.org>; Michal Simek <michal.simek@amd.com>; Simona Vetter <simona@ffwll.ch>; Thomas Zimmermann <tzimmermann@suse.de>; Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>; Vishal Sagar <vishal.sagar@amd.com> 主题: Re: [v2] drm: xlnx: zynqmp_dpsub: Add NULL checks in zynqmp_audio_init() … > Add NULL check in zynqmp_audio_init(), to handle kernel NULL pointer > dereference error. * Can it be more desirable to prevent such issues? * Would the message subject have been nicer with a key word like “PATCH” (besides other refinements)? … > --- > drivers/gpu/drm/xlnx/zynqmp_dp_audio.c | 4 ++++ … Will you become more familiar with patch version descriptions? https://lore.kernel.org/all/?q=%22This+looks+like+a+new+version+of+a+previously+submitted+patch%22 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.14-rc2#n310 Regards, Markus
© 2016 - 2025 Red Hat, Inc.