From b975abbd382fe442713a4c233549abb90e57c22b Mon Sep 17 00:00:00 2001
From: Qiushi Wu <wu000273@umn.edu>
Date: Fri, 22 May 2020 09:34:51 +0100
Subject: [PATCH] agp/intel: Fix a memory leak on module initialisation failure
Git-commit: b975abbd382fe442713a4c233549abb90e57c22b
Patch-mainline: v5.9-rc1
References: git-fixes
In intel_gtt_setup_scratch_page(), pointer "page" is not released if
pci_dma_mapping_error() return an error, leading to a memory leak on
module initialisation failure. Simply fix this issue by freeing "page"
before return.
Fixes: 0e87d2b06cb46 ("intel-gtt: initialize our own scratch page")
Signed-off-by: Qiushi Wu <wu000273@umn.edu>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200522083451.7448-1-chris@chris-wilson.co.uk
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/char/agp/intel-gtt.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 4b34a5195c65..5bfdf222d5f9 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -304,8 +304,10 @@ static int intel_gtt_setup_scratch_page(void)
if (intel_private.needs_dmar) {
dma_addr = pci_map_page(intel_private.pcidev, page, 0,
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
- if (pci_dma_mapping_error(intel_private.pcidev, dma_addr))
+ if (pci_dma_mapping_error(intel_private.pcidev, dma_addr)) {
+ __free_page(page);
return -EINVAL;
+ }
intel_private.scratch_page_dma = dma_addr;
} else
--
2.16.4