If memory allocation failed in first loop, root will be NULL and will lead to kernel panic.
Signed-off-by: Leon Ma <xindong...@intel.com> --- mm/rmap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/rmap.c b/mm/rmap.c index 9c3e773..6e53aed 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -246,8 +246,10 @@ int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src) avc = anon_vma_chain_alloc(GFP_NOWAIT | __GFP_NOWARN); if (unlikely(!avc)) { - unlock_anon_vma_root(root); - root = NULL; + if (!root) { + unlock_anon_vma_root(root); + root = NULL; + } avc = anon_vma_chain_alloc(GFP_KERNEL); if (!avc) goto enomem_failure; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/