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fuse: prevent overflow in copy_file_range return value 

commit 1e08938c36 upstream.

The FUSE protocol uses struct fuse_write_out to convey the return value of
copy_file_range, which is restricted to uint32_t.  But the COPY_FILE_RANGE
interface supports a 64-bit size copies.

Currently the number of bytes copied is silently truncated to 32-bit, which
may result in poor performance or even failure to copy in case of
truncation to zero.

Reported-by: Florian Weimer <fweimer@redhat.com>
Closes: https://lore.kernel.org/all/lhuh5ynl8z5.fsf@oldenburg.str.redhat.com/
Fixes: 88bc7d5097 ("fuse: add support for copy_file_range()")
Cc: <stable@vger.kernel.org> # v4.20
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miklos Szeredi 2025-08-12 14:46:34 +02:00 committed by Greg Kroah-Hartman
parent b7c40f063f
commit 532b87643f
1 changed files with 1 additions and 1 deletions
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2
fs/fuse/file.c
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@ -3229,7 +3229,7 @@ static ssize_t __fuse_copy_file_range(struct file *file_in, loff_t pos_in,
.nodeid_out = ff_out->nodeid, .nodeid_out = ff_out->nodeid,
.fh_out = ff_out->fh, .fh_out = ff_out->fh,
.off_out = pos_out, .off_out = pos_out,
.len = len, .len = min_t(size_t, len, UINT_MAX & PAGE_MASK),
.flags = flags .flags = flags
}; };
struct fuse_write_out outarg; struct fuse_write_out outarg;