[Intel-gfx] [PATCH] drm/i915: Fix a possible use of uninitialized variable in remap_io_sg()

From: "José Roberto de Souza" <jose.souza@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Christoph Hellwig <hch@lst.de>
Subject: [Intel-gfx] [PATCH] drm/i915: Fix a possible use of uninitialized variable in remap_io_sg()
Date: Thu, 13 May 2021 16:28:41 -0700	[thread overview]
Message-ID: <20210513232841.147989-1-jose.souza@intel.com> (raw)

If the do while loop breaks in 'if (!sg_dma_len(sgl))' in the first
iteration, err is uninitialized causing a wrong call to zap_vma_ptes().

Fixes: b12d691ea5e0 ("i915: fix remap_io_sg to verify the pgprot")
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Ausmus <james.ausmus@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/i915/i915_mm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_mm.c b/drivers/gpu/drm/i915/i915_mm.c
index 4c8cd08c672d..25576fa73ff0 100644
--- a/drivers/gpu/drm/i915/i915_mm.c
+++ b/drivers/gpu/drm/i915/i915_mm.c
@@ -47,7 +47,7 @@ int remap_io_sg(struct vm_area_struct *vma,
 		struct scatterlist *sgl, resource_size_t iobase)
 {
 	unsigned long pfn, len, remapped = 0;
-	int err;
+	int err = 0;
 
 	/* We rely on prevalidation of the io-mapping to skip track_pfn(). */
 	GEM_BUG_ON((vma->vm_flags & EXPECTED_FLAGS) != EXPECTED_FLAGS);
-- 
2.31.1

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