From: Darrick J. Wong <darrick.wong@xxxxxxxxxx> Don't let the iomap callback get away with feeding us a garbage zero length mapping -- there was a bug in xfs that resulted in those leaking out to hilarious effect. Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> --- fs/iomap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/iomap.c b/fs/iomap.c index e5de772..afd1635 100644 --- a/fs/iomap.c +++ b/fs/iomap.c @@ -65,6 +65,8 @@ iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags, return ret; if (WARN_ON(iomap.offset > pos)) return -EIO; + if (WARN_ON(iomap.length == 0)) + return -EIO; /* * Cut down the length to the one actually provided by the filesystem, -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
