linux-kernel - [PATCH] staging: sm750fb: Call iounmap() to free mapped bus memory

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Date:   Sat,  2 Apr 2022 19:56:55 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Teddy Wang <teddy.wang@...iconmotion.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-fbdev@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, outreachy@...ts.linux.dev
Cc:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Subject: [PATCH] staging: sm750fb: Call iounmap() to free mapped bus memory

If ioremap_wc() fails, the code jumps to the "exit" label and forgets to
free the bus memory mapped into "sm750_dev->pvReg". Mapped bus memory must
always be freed by calling iounmap().

Call iounmap(sm750_dev->pvReg) when the above-mentioned failures happen.

The site of the missing iounmap() has been detected by Smatch.

Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
---
 drivers/staging/sm750fb/sm750_hw.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/sm750fb/sm750_hw.c b/drivers/staging/sm750fb/sm750_hw.c
index a7c6eb07b62e..55cb00e8b0d1 100644
--- a/drivers/staging/sm750fb/sm750_hw.c
+++ b/drivers/staging/sm750fb/sm750_hw.c
@@ -81,6 +81,7 @@ int hw_sm750_map(struct sm750_dev *sm750_dev, struct pci_dev *pdev)
 	sm750_dev->pvMem =
 		ioremap_wc(sm750_dev->vidmem_start, sm750_dev->vidmem_size);
 	if (!sm750_dev->pvMem) {
+		iounmap(sm750_dev->pvReg);
 		pr_err("Map video memory failed\n");
 		ret = -EFAULT;
 		goto exit;
-- 
2.34.1