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iomap: warn on zero-length mappings

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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@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2018-01-26 11:11:20 -08:00
parent 4b4c1326fd
commit 0c6dda7a1c
1 changed files with 2 additions and 0 deletions
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2
fs/iomap.c
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@ -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,