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authorChuck Lever <chuck.lever@oracle.com>2022-06-30 16:48:18 -0400
committerChuck Lever <chuck.lever@oracle.com>2022-06-30 17:41:08 -0400
commita23dd544debcda4ee4a549ec7de59e85c3c8345c (patch)
treeaa3b6b3a3a446080d8a9d66e65d70689f1bacea3 /net/sunrpc
parent8a9ffb8c857c2c99403bd6483a5a005fed5c0773 (diff)
SUNRPC: Fix READ_PLUS crasher
Looks like there are still cases when "space_left - frag1bytes" can legitimately exceed PAGE_SIZE. Ensure that xdr->end always remains within the current encode buffer. Reported-by: Bruce Fields <bfields@fieldses.org> Reported-by: Zorro Lang <zlang@redhat.com> Link: https://bugzilla.kernel.org/show_bug.cgi?id=216151 Fixes: 6c254bf3b637 ("SUNRPC: Fix the calculation of xdr->end in xdr_get_next_encode_buffer()") Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/xdr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index f87a2d8f23a7..5d2b3e6979fb 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -984,7 +984,7 @@ static noinline __be32 *xdr_get_next_encode_buffer(struct xdr_stream *xdr,
p = page_address(*xdr->page_ptr);
xdr->p = p + frag2bytes;
space_left = xdr->buf->buflen - xdr->buf->len;
- if (space_left - nbytes >= PAGE_SIZE)
+ if (space_left - frag1bytes >= PAGE_SIZE)
xdr->end = p + PAGE_SIZE;
else
xdr->end = p + space_left - frag1bytes;