[PATCH] SUNRPC: Fix gss_free_in_token_pages()

[cel@kernel.org]

From: Chuck Lever <chuck.lever@oracle.com>

Commit 5866efa8cbfb ("SUNRPC: Fix svcauth_gss_proxy_init()") from Oct
24, 2019 (linux-next), leads to the following Smatch static checker
warning:

	net/sunrpc/auth_gss/svcauth_gss.c:1039 gss_free_in_token_pages()
	warn: iterator 'i' not incremented

net/sunrpc/auth_gss/svcauth_gss.c
    1034 static void gss_free_in_token_pages(struct gssp_in_token *in_token)
    1035 {
    1036         u32 inlen;
    1037         int i;
    1038
--> 1039         i = 0;
    1040         inlen = in_token->page_len;
    1041         while (inlen) {
    1042                 if (in_token->pages[i])
    1043                         put_page(in_token->pages[i]);
                                                         ^
This puts page zero over and over.

    1044                 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
    1045         }
    1046
    1047         kfree(in_token->pages);
    1048         in_token->pages = NULL;
    1049 }

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Fixes: 5866efa8cbfb ("SUNRPC: Fix svcauth_gss_proxy_init()")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 net/sunrpc/auth_gss/svcauth_gss.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
index 24de94184700..bdd8273d74d3 100644
--- a/net/sunrpc/auth_gss/svcauth_gss.c
+++ b/net/sunrpc/auth_gss/svcauth_gss.c
@@ -1040,7 +1040,7 @@ static void gss_free_in_token_pages(struct gssp_in_token *in_token)
 	inlen = in_token->page_len;
 	while (inlen) {
 		if (in_token->pages[i])
-			put_page(in_token->pages[i]);
+			put_page(in_token->pages[i++]);
 		inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
 	}
 

base-commit: 939cb14d51a150e3c12ef7a8ce0ba04ce6131bd2
-- 
2.44.0