This is a note to let you know that I've just added the patch titled
nfsd: COPY with length 0 should copy to end of file
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsd-copy-with-length-0-should-copy-to-end-of-file.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a91173819ee1e4f198ca81e18558f39c74176b9f
Author: J. Bruce Fields <bfields@xxxxxxxxxxxx>
Date: Thu Mar 18 20:03:23 2021 -0400
nfsd: COPY with length 0 should copy to end of file
[ Upstream commit 792a5112aa90e59c048b601c6382fe3498d75db7 ]
>From https://tools.ietf.org/html/rfc7862#page-65
A count of 0 (zero) requests that all bytes from ca_src_offset
through EOF be copied to the destination.
Reported-by: <radchenkoy@xxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 2fba0808d975c..949d9cedef5d1 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1380,6 +1380,9 @@ static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy)
u64 src_pos = copy->cp_src_pos;
u64 dst_pos = copy->cp_dst_pos;
+ /* See RFC 7862 p.67: */
+ if (bytes_total == 0)
+ bytes_total = ULLONG_MAX;
do {
if (kthread_should_stop())
break;
