Commit 7855eba4 authored by Yunlei He's avatar Yunlei He Committed by Jaegeuk Kim

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: 0f825ee6 ("f2fs: add new interfaces for extent tree")
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarYunlei He <heyunlei@huawei.com>
Reviewed-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 07fe8d44
...@@ -352,11 +352,12 @@ static struct extent_node *__try_merge_extent_node(struct inode *inode, ...@@ -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 (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.fofs = ei->fofs;
next_ex->ei.blk = ei->blk; next_ex->ei.blk = ei->blk;
next_ex->ei.len += ei->len; next_ex->ei.len += ei->len;
if (en)
__release_extent_node(sbi, et, prev_ex);
en = next_ex; en = next_ex;
} }
......
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