From: Trond Myklebust <trond.myklebust@hammerspace.com>
Date: Thu, 7 Apr 2022 14:10:23 -0400
Subject: [PATCH] SUNRPC: svc_tcp_sendmsg() should handle errors from
 xdr_alloc_bvec()
Git-commit: b056fa070814897be32d83b079dbc311375588e7
Patch-mainline: v5.18
References: git-fixes

The allocation is done with GFP_KERNEL, but it could still fail in a low
memory situation.

Fixes: 4a85a6a3320b ("SUNRPC: Handle TCP socket sends with kernel_sendpage() again")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Acked-by: NeilBrown <neilb@suse.com>

---
 net/sunrpc/svcsock.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -1096,7 +1096,9 @@ static int svc_tcp_sendmsg(struct socket
 	int ret;
 
 	*sentp = 0;
-	xdr_alloc_bvec(xdr, GFP_KERNEL);
+	ret = xdr_alloc_bvec(xdr, GFP_KERNEL);
+	if (ret < 0)
+		return ret;
 
 	ret = kernel_sendmsg(sock, &msg, &rm, 1, rm.iov_len);
 	if (ret < 0)