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agp/intel: Fix a memory leak on module initialisation failure 

[ Upstream commit b975abbd38 ]

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: 0e87d2b06c ("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
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Qiushi Wu 2020-05-22 09:34:51 +01:00 committed by Greg Kroah-Hartman
parent 7669b6beb4
commit e3b04e1b5b
1 changed files with 3 additions and 1 deletions
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4
drivers/char/agp/intel-gtt.c
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@ -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