`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@gmail.com Fixes: 71bcada88b0f3 ("edac: altera: Add Altera SDRAM EDAC support") Cc: Markus Elfring Markus.Elfring@web.de Cc: Dinh Nguyen dinguyen@kernel.org Cc: Borislav Petkov bp@alien8.de Cc: Tony Luck tony.luck@intel.com Cc: James Morse james.morse@arm.com Cc: Mauro Carvalho Chehab mchehab@kernel.org Cc: Robert Richter rric@kernel.org Cc: linux-edac@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.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;