If `depth' is less or equal to `at', a buffer underrun occurs
Signed-off-by: Roel Kluin <roel.kluin@xxxxxxxxx>
---
I am not sure whether this is possible.
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index afea652..25bc182 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -822,7 +822,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
}
/* initialize new leaf */
- newblock = ablocks[--a];
+ newblock = a ? ablocks[--a] : 0;
BUG_ON(newblock == 0);
bh = sb_getblk(inode->i_sb, newblock);
if (!bh) {
--
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