From: Ernesto A. Fernández Date: Sat, 24 Jun 2017 00:37:21 +0000 (-0300) Subject: ext2: Fix memory leak when truncate races ext2_get_blocks X-Git-Tag: v4.13-rc1~33^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4d9bcaddacf23861c5ee088b0c03e7034c3d59d6;p=platform%2Fkernel%2Flinux-exynos.git ext2: Fix memory leak when truncate races ext2_get_blocks 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 --- diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c index 2dcbd56..30163d0 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));