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SUNRPC: Fix READ_PLUS crasher

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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: 6c254bf3b6 ("SUNRPC: Fix the calculation of xdr->end in xdr_get_next_encode_buffer()")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2022-06-30 16:48:18 -04:00
parent 8a9ffb8c85
commit a23dd544de
1 changed files with 1 additions and 1 deletions
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2
net/sunrpc/xdr.c
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@ -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;