linux-kernel - [PATCH] EDAC: altera: Delete an inappropriate dma_free_coherent() call in altr_sdr_mc_err_inject

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Message-ID: <aIrfzzqh4IzYtDVC@pc>
Date: Thu, 31 Jul 2025 04:15:27 +0100
From: Salah Triki <salah.triki@...il.com>
To: Markus Elfring <Markus.Elfring@....de>,
	Dinh Nguyen <dinguyen@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Tony Luck <tony.luck@...el.com>, James Morse <james.morse@....com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Robert Richter <rric@...nel.org>, linux-edac@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH] EDAC: altera: Delete an inappropriate dma_free_coherent()
 call in altr_sdr_mc_err_inject_write()

`dma_free_coherent()` must only be called if the corresponding
`dma_alloc_coherent()` call has succeeded. Calling it when the allocation
fails leads to undefined behavior.

Add a check to ensure that the memory is only freed when the allocation
was successful.

Signed-off-by: Salah Triki <salah.triki@...il.com>
Fixes: 71bcada88b0f3 ("edac: altera: Add Altera SDRAM EDAC support")
Cc: Markus Elfring <Markus.Elfring@....de>
Cc: Dinh Nguyen <dinguyen@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Tony Luck <tony.luck@...el.com>
Cc: James Morse <james.morse@....com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Robert Richter <rric@...nel.org>
Cc: linux-edac@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: stable@...r.kernel.org
---
 drivers/edac/altera_edac.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index cae52c654a15..7685a8550d4b 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -128,7 +128,6 @@ static ssize_t altr_sdr_mc_err_inject_write(struct file *file,
 
 	ptemp = dma_alloc_coherent(mci->pdev, 16, &dma_handle, GFP_KERNEL);
 	if (!ptemp) {
-		dma_free_coherent(mci->pdev, 16, ptemp, dma_handle);
 		edac_printk(KERN_ERR, EDAC_MC,
 			    "Inject: Buffer Allocation error\n");
 		return -ENOMEM;
-- 
2.43.0