[PATCH] f2fs: fix negative value for lseek offset

[Jaegeuk Kim]

If application throws negative value of lseek with SEEK_DATA|SEEK_HOLE,
previous f2fs went into BUG_ON in get_dnode_of_data, which was reported
by Tommi Rantala.

He could make a simple code to detect this having:
	lseek(fd, -17595150933902LL, SEEK_DATA);

This patch should resolve that bug.

Reported-by: Tommi Rentala <tt.rantala@xxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
 fs/f2fs/file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 9f0ea3d..c9a1295 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -281,7 +281,7 @@ static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
 	mutex_lock(&inode->i_mutex);
 
 	isize = i_size_read(inode);
-	if (offset >= isize)
+	if (offset >= isize || offset < 0)
 		goto fail;
 
 	/* handle inline data case */
-- 
1.8.5.2 (Apple Git-48)

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