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authorLiviu Dudau <liviu@dudau.co.uk>2019-03-06 02:42:54 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-06-03 09:18:11 +0300
commitbe22b6df6d80494ad855ed04fb990267d2db2f15 (patch)
tree4a524a0d07ddc938dcf6d182291f0c71c6488809 /mm
parent97af903f0f3882ceb202080c2369f015d843b895 (diff)
downloadlinux-be22b6df6d80494ad855ed04fb990267d2db2f15.tar.xz
mm/vmalloc.c: don't dereference possible NULL pointer in __vunmap()
commit 6ade20327dbb808882888ed8ccded71e93067cf9 upstream. find_vmap_area() can return a NULL pointer and we're going to dereference it without checking it first. Use the existing find_vm_area() function which does exactly what we want and checks for the NULL pointer. Link: http://lkml.kernel.org/r/20181228171009.22269-1-liviu@dudau.co.uk Fixes: f3c01d2f3ade ("mm: vmalloc: avoid racy handling of debugobjects in vunmap") Signed-off-by: Liviu Dudau <liviu@dudau.co.uk> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Chintan Pandya <cpandya@codeaurora.org> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/vmalloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 63bf3f207e16..e8c64dddfecd 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1524,7 +1524,7 @@ static void __vunmap(const void *addr, int deallocate_pages)
addr))
return;
- area = find_vmap_area((unsigned long)addr)->vm;
+ area = find_vm_area(addr);
if (unlikely(!area)) {
WARN(1, KERN_ERR "Trying to vfree() nonexistent vm area (%p)\n",
addr);