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SUNRPC: Fix gss_free_in_token_pages()

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[ Upstream commit bafa6b4d95 ]

Dan Carpenter says:
> Commit 5866efa8cb ("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 }

Based on the way that the ->pages[] array is constructed in
gss_read_proxy_verf(), we know that once the loop encounters a NULL
page pointer, the remaining array elements must also be NULL.

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Suggested-by: Trond Myklebust <trondmy@hammerspace.com>
Fixes: 5866efa8cb ("SUNRPC: Fix svcauth_gss_proxy_init()")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chuck Lever 2024-05-07 09:10:41 -04:00 committed by Greg Kroah-Hartman
parent 627493443f
commit a3c1afd5d7
1 changed files with 2 additions and 8 deletions
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10
net/sunrpc/auth_gss/svcauth_gss.c
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@ -1033,17 +1033,11 @@ svcauth_gss_proc_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
static void gss_free_in_token_pages(struct gssp_in_token *in_token)
{
u32 inlen;
int i;
i = 0;
inlen = in_token->page_len;
while (inlen) {
if (in_token->pages[i])
put_page(in_token->pages[i]);
inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
}
while (in_token->pages[i])
put_page(in_token->pages[i++]);
kfree(in_token->pages);
in_token->pages = NULL;
}