From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Wed, 3 Feb 2021 15:28:44 +0000 (-0500)
Subject: mm/mmap: Fix error path not checking anon_vma for null
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=b42899ffcae24f9079d0deb3cc1c0a41a15abd1d;p=users%2Fjedix%2Flinux-maple.git

mm/mmap: Fix error path not checking anon_vma for null

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---

diff --git a/mm/mmap.c b/mm/mmap.c
index ae7e2690ad6f..e6fe0b636e90 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2974,8 +2974,10 @@ munmap_full_vma:
 	return ret;
 
 mas_store_fail:
-	anon_vma_interval_tree_post_update_vma(vma);
-	anon_vma_unlock_write(vma->anon_vma);
+	if (vma->anon_vma) {
+		anon_vma_interval_tree_post_update_vma(vma);
+		anon_vma_unlock_write(vma->anon_vma);
+	}
 	return -ENOMEM;
 }
 
@@ -3087,8 +3089,10 @@ vma_alloc_fail:
 
 mas_mod_fail:
 	vma->vm_end = addr;
-	anon_vma_interval_tree_post_update_vma(vma);
-	anon_vma_unlock_write(vma->anon_vma);
+	if (vma->anon_vma) {
+		anon_vma_interval_tree_post_update_vma(vma);
+		anon_vma_unlock_write(vma->anon_vma);
+	}
 	return -ENOMEM;
 
 }