4.19-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@linaro.org
[ Upstream commit 6dbf1f341b6b35bcc20ff95b6b315e509f6c5369 ]
The math in "rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)" could have an integer overflow. Add bounds checking on rc_list->rcl_nrefcalls to fix that.
Fixes: 4aece6a19cf7 ("nfs41: cb_sequence xdr implementation") Signed-off-by: Dan Carpenter dan.carpenter@linaro.org Signed-off-by: Anna Schumaker anna.schumaker@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/nfs/callback_xdr.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c index 38dc33c537ab6..8f8b3a7868e8d 100644 --- a/fs/nfs/callback_xdr.c +++ b/fs/nfs/callback_xdr.c @@ -372,6 +372,8 @@ static __be32 decode_rc_list(struct xdr_stream *xdr,
rc_list->rcl_nrefcalls = ntohl(*p++); if (rc_list->rcl_nrefcalls) { + if (unlikely(rc_list->rcl_nrefcalls > xdr->buf->len)) + goto out; p = xdr_inline_decode(xdr, rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); if (unlikely(p == NULL))