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| author |   Darrick J. Wong <darrick.wong@oracle.com> | 2018-10-30 10:40:39 +1100 |
|---|---|---|
| committer |   Dave Chinner <david@fromorbit.com> | 2018-10-30 10:40:39 +1100 |
| commit | 2c5773f102c9bb07d5328467f61f0a88f2f2892d (patch) | |
| tree | d756b4acc043cd59ca1e89b394fb16c375683833 /fs/read_write.c | |
| parent | vfs: check file ranges before cloning files (diff) | |
| download | linux-dev-2c5773f102c9bb07d5328467f61f0a88f2f2892d.tar.xz linux-dev-2c5773f102c9bb07d5328467f61f0a88f2f2892d.zip | |
vfs: exit early from zero length remap operations
If a remap caller asks us to remap to the source file's EOF and the
source file length leaves us with a zero byte request, exit early.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/read_write.c')
| -rw-r--r-- | fs/read_write.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index d6e8e242a15f..2456da3f8a41 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1748,6 +1748,8 @@ int vfs_clone_file_prep(struct file *file_in, loff_t pos_in, if (pos_in > isize) return -EINVAL; *len = isize - pos_in; + if (*len == 0) + return 0; } /* Check that we don't violate system file offset limits. */ |