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authorvenkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com>2009-01-09 16:13:09 -0800
committerIngo Molnar <mingo@elte.hu>2009-01-13 19:12:59 +0100
commita36706131182f5507d1e2cfbf391b0fa8d72203c (patch)
tree46aede534e494045b7cbe4df42b780ca138e6d3e
parente0b325d310a6b11f1538413fd557d2eb98f2fae5 (diff)
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x86 PAT: remove PFNMAP type on track_pfn_vma_new() error
Impact: fix (harmless) double-free of memtype entries and avoid warning On track_pfn_vma_new() failure, reset the vm_flags so that there will be no second cleanup happening when upper level routines call unmap_vmas(). This patch fixes part of the bug reported here: http://marc.info/?l=linux-kernel&m=123108883716357&w=2 Specifically the error message: X:5010 freeing invalid memtype d0000000-d0101000 Is due to multiple frees on error path, will not happen with the patch below. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--mm/memory.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c
index c2d4c477e5b..d3ee2ea5615 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1672,8 +1672,14 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
err = track_pfn_vma_new(vma, prot, pfn, PAGE_ALIGN(size));
- if (err)
+ if (err) {
+ /*
+ * To indicate that track_pfn related cleanup is not
+ * needed from higher level routine calling unmap_vmas
+ */
+ vma->vm_flags &= ~(VM_IO | VM_RESERVED | VM_PFNMAP);
return -EINVAL;
+ }
BUG_ON(addr >= end);
pfn -= addr >> PAGE_SHIFT;