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[net] SUNRPC: Fix null pointer dereference in svc_rqst_free()

Message ID 1619170978-15192-1-git-send-email-wangyunjian@huawei.com
State New
Headers show
Series [net] SUNRPC: Fix null pointer dereference in svc_rqst_free() | expand

Commit Message

wangyunjian April 23, 2021, 9:42 a.m. UTC 
From: Yunjian Wang <wangyunjian@huawei.com>

When alloc_pages_node() returns null in svc_rqst_alloc(), the
null rq_scratch_page pointer will be dereferenced when calling
put_page() in svc_rqst_free(). Fix it by adding a null check.

Addresses-Coverity: ("Dereference after null check")
Fixes: 5191955d6fc6 ("SUNRPC: Prepare for xdr_stream-style decoding on the server-side")
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
---
 net/sunrpc/svc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index d76dc9d95d16..0de918cb3d90 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -846,7 +846,8 @@  void
 svc_rqst_free(struct svc_rqst *rqstp)
 {
 	svc_release_buffer(rqstp);
-	put_page(rqstp->rq_scratch_page);
+	if (rqstp->rq_scratch_page)
+		put_page(rqstp->rq_scratch_page);
 	kfree(rqstp->rq_resp);
 	kfree(rqstp->rq_argp);
 	kfree(rqstp->rq_auth_data);