From: Chuck Lever chuck.lever@oracle.com
stable inclusion from stable-v6.6.33 commit c1d8c429e4d2ce85ec5c92cf71cb419baf75c56f category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAD6H2
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit bafa6b4d95d97877baa61883ff90f7e374427fae ]
Dan Carpenter says:
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 }
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: 5866efa8cbfb ("SUNRPC: Fix svcauth_gss_proxy_init()") Signed-off-by: Chuck Lever chuck.lever@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Wang Hai wanghai38@huawei.com --- net/sunrpc/auth_gss/svcauth_gss.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c index 18734e70c5dd..708297f33875 100644 --- a/net/sunrpc/auth_gss/svcauth_gss.c +++ b/net/sunrpc/auth_gss/svcauth_gss.c @@ -1043,17 +1043,11 @@ 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; }