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| author | Yunlei He <heyunlei@huawei.com> | 2016-12-19 15:10:48 +0300 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-01-29 06:46:01 +0300 |
| commit | 7855eba4d6102f811b6dd142d6c749f53b591fa3 (patch) | |
| tree | fe3d4bd41eec36e334bacc074a134e10626db079 | |
| parent | 07fe8d44409f88be8f4a4e8f22b47ee709a22657 (diff) | |
| download | linux-7855eba4d6102f811b6dd142d6c749f53b591fa3.tar.xz | |
f2fs: fix a problem of using memory after free
This patch fix a problem of using memory after free
in function __try_merge_extent_node.
Fixes: 0f825ee6e873 ("f2fs: add new interfaces for extent tree")
Cc: <stable@vger.kernel.org>
Signed-off-by: Yunlei He <heyunlei@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
| -rw-r--r-- | fs/f2fs/extent_cache.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c index 4db44da7ef69..e02c3d88dc9a 100644 --- a/fs/f2fs/extent_cache.c +++ b/fs/f2fs/extent_cache.c @@ -352,11 +352,12 @@ static struct extent_node *__try_merge_extent_node(struct inode *inode, } if (next_ex && __is_front_mergeable(ei, &next_ex->ei)) { - if (en) - __release_extent_node(sbi, et, prev_ex); next_ex->ei.fofs = ei->fofs; next_ex->ei.blk = ei->blk; next_ex->ei.len += ei->len; + if (en) + __release_extent_node(sbi, et, prev_ex); + en = next_ex; } |