X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Frmap.c;h=98f0bf7fc50d1bdaa16506a466b0508602ef6157;hb=7a8f94b0198aa17034da702f020411ad996f63e2;hp=2c4ee3e9f4f3eb04555fc01524194a0695bcf45a;hpb=1d61507ce4a5642f3c5de0e14227fd182985613a;p=pandora-kernel.git

diff --git a/mm/rmap.c b/mm/rmap.c
index 2c4ee3e9f4f3..98f0bf7fc50d 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -295,6 +295,13 @@ int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src)
 	return 0;
 
  enomem_failure:
+	/*
+	 * dst->anon_vma is dropped here otherwise its degree can be incorrectly
+	 * decremented in unlink_anon_vmas().
+	 * We can safely do this because callers of anon_vma_clone() don't care
+	 * about dst->anon_vma if anon_vma_clone() failed.
+	 */
+	dst->anon_vma = NULL;
 	unlink_anon_vmas(dst);
 	return -ENOMEM;
 }