From b7dbb1ee1fbd445f82c508e4ea9d9af7b25d3c72 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@google.com>
Date: Tue, 19 Apr 2022 18:41:40 +0200
Subject: [PATCH] Revert "coredump: Remove the WARN_ON in dump_vma_snapshot"

This reverts commit b043ae637a83585b2a497c2eb7ee49446fc68e98.

It breaks the abi and is not needed for Android devices so it can be
dropped.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I565f6e1c6053b1d43aa7fb69e0f6b533401d16be
---
 fs/coredump.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/coredump.c b/fs/coredump.c
index d3799bc317b9..a605bd610867 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -1128,6 +1128,12 @@ static bool dump_vma_snapshot(struct coredump_params *cprm)
 
 	mmap_write_unlock(mm);
 
+	if (WARN_ON(i != cprm->vma_count)) {
+		kvfree(cprm->vma_meta);
+		return false;
+	}
+
+
 	for (i = 0; i < cprm->vma_count; i++) {
 		struct core_vma_metadata *m = cprm->vma_meta + i;