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vfs: limit size of dedupe

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Suggested-by: Darrick J. Wong <darrick.wong@oracle.com> 
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2018-07-06 23:57:02 +02:00
parent ce397d215c
commit 92b66d2cdd
1 changed files with 3 additions and 0 deletions
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3
fs/read_write.c
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@ -2003,6 +2003,9 @@ int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same)
if (off + len > i_size_read(src))
return -EINVAL;
/* Arbitrary 1G limit on a single dedupe request, can be raised. */
len = min_t(u64, len, 1 << 30);
/* pre-format output fields to sane values */
for (i = 0; i < count; i++) {
same->info[i].bytes_deduped = 0ULL;