SUNRPC: Fix integer overflow in decode_rc_list()

[PATCH] SUNRPC: Fix integer overflow in decode_rc_list()

Dan Carpenter posted 1 patch 2 months, 1 week ago

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fs/nfs/callback_xdr.c | 2 ++
1 file changed, 2 insertions(+)

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[PATCH] SUNRPC: Fix integer overflow in decode_rc_list()

Posted by Dan Carpenter 2 months, 1 week ago

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>
---
From static analysis.

 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 6df77f008d3f..fdeb0b34a3d3 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -375,6 +375,8 @@ 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))
-- 
2.34.1