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| author |   Avi Kivity <avi@cloudius-systems.com> | 2014-06-26 17:23:12 +0300 |
|---|---|---|
| committer |   J. Bruce Fields <bfields@redhat.com> | 2014-07-02 17:37:13 -0400 |
| commit | 69bbd9c7b99974f3a701d4de6ef7010c37182a47 (patch) | |
| tree | b1a964247f6e28d25d44605ed811daa681ac0a10 /fs/nfsd | |
| parent | nfsd: fix rare symlink decoding bug (diff) | |
| download | linux-dev-69bbd9c7b99974f3a701d4de6ef7010c37182a47.tar.xz linux-dev-69bbd9c7b99974f3a701d4de6ef7010c37182a47.zip | |
nfs: fix nfs4d readlink truncated packet
XDR requires 4-byte alignment; nfs4d READLINK reply writes out the padding,
but truncates the packet to the padding-less size.
Fix by taking the padding into consideration when truncating the packet.
Symptoms:
# ll /mnt/
ls: cannot read symbolic link /mnt/test: Input/output error
total 4
-rw-r--r--. 1 root root 0 Jun 14 01:21 123456
lrwxrwxrwx. 1 root root 6 Jul 2 03:33 test
drwxr-xr-x. 1 root root 0 Jul 2 23:50 tmp
drwxr-xr-x. 1 root root 60 Jul 2 23:44 tree
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
Fixes: 476a7b1f4b2c (nfsd4: don't treat readlink like a zero-copy operation)
Reviewed-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/nfs4xdr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 5b4fef55676a..2fc7abebeb9b 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -3278,7 +3278,7 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd wire_count = htonl(maxcount); write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4); - xdr_truncate_encode(xdr, length_offset + 4 + maxcount); + xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4)); if (maxcount & 3) write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero, 4 - (maxcount&3)); |