From 4d9bcaddacf23861c5ee088b0c03e7034c3d59d6 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ernesto=20A=2E=20Fern=C3=A1ndez?= Date: Fri, 23 Jun 2017 21:37:21 -0300 Subject: [PATCH] ext2: Fix memory leak when truncate races ext2_get_blocks MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Buffer heads referencing indirect blocks may not be released if the file is truncated at the right time. This happens because ext2_get_branch() returns NULL when it finds the whole chain of indirect blocks already set, and when truncate alters the chain this value of NULL is treated as the address of the last head to be released. Handle this in the same way as it's done after the got_it label. Signed-off-by: Ernesto A. Fernández Signed-off-by: Jan Kara --- fs/ext2/inode.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c index 2dcbd5698884..30163d007b2f 100644 --- a/fs/ext2/inode.c +++ b/fs/ext2/inode.c @@ -659,6 +659,7 @@ static int ext2_get_blocks(struct inode *inode, */ err = -EAGAIN; count = 0; + partial = chain + depth - 1; break; } blk = le32_to_cpu(*(chain[depth-1].p + count)); -- 2.20.1