linux-kernel - [PATCH] fbdev: au1200fb: Fix missing IRQ check in au1200fb_drv

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Message-ID: <tencent_DB7525706E9A6B13B7E6C1C43C36145A5009@qq.com>
Date:   Sat, 15 Jul 2023 16:16:56 +0800
From:   Zhang Shurong <zhang_shurong@...mail.com>
To:     deller@....de
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Zhang Shurong <zhang_shurong@...mail.com>
Subject: [PATCH] fbdev: au1200fb: Fix missing IRQ check in au1200fb_drv_probe

This func misses checking for platform_get_irq()'s call and may passes the
negative error codes to request_irq(), which takes unsigned IRQ #,
causing it to fail with -EINVAL, overriding an original error code.

Fix this by stop calling request_irq() with invalid IRQ #s.

Fixes: 1630d85a8312 ("au1200fb: fix hardcoded IRQ")
Signed-off-by: Zhang Shurong <zhang_shurong@...mail.com>
---
 drivers/video/fbdev/au1200fb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/video/fbdev/au1200fb.c b/drivers/video/fbdev/au1200fb.c
index 5c232eb13724..c137d6afe484 100644
--- a/drivers/video/fbdev/au1200fb.c
+++ b/drivers/video/fbdev/au1200fb.c
@@ -1732,6 +1732,9 @@ static int au1200fb_drv_probe(struct platform_device *dev)
 
 	/* Now hook interrupt too */
 	irq = platform_get_irq(dev, 0);
+	if (irq < 0)
+		return irq;
+
 	ret = request_irq(irq, au1200fb_handle_irq,
 			  IRQF_SHARED, "lcd", (void *)dev);
 	if (ret) {
-- 
2.30.2