cifs: fix the format specifiers in sid_to_str

The format specifiers are for signed values, but these are unsigned.
Given that '-' is a delimiter between fields, I don't think you'd get
what you'd expect if you got a value here that would overflow the sign
bit.

The version and authority fields are 8 bit values so use a "hh" length
modifier there. The subauths are 32 bit values, so there's no need to
use a "l" length modifier there.

Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 4 insertions, 7 deletions

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index dd8d3df74298..9adcdb5a1001 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -199,27 +199,24 @@ static void
 sid_to_str(struct cifs_sid *sidptr, char *sidstr)
 {
         int i;
-        unsigned long saval;
+        unsigned int saval;
         char *strptr;
 
         strptr = sidstr;
 
-        sprintf(strptr, "%s", "S");
-        strptr = sidstr + strlen(sidstr);
-
-        sprintf(strptr, "-%d", sidptr->revision);
+        sprintf(strptr, "S-%hhu", sidptr->revision);
         strptr = sidstr + strlen(sidstr);
 
         for (i = 0; i < NUM_AUTHS; ++i) {
                 if (sidptr->authority[i]) {
-                        sprintf(strptr, "-%d", sidptr->authority[i]);
+                        sprintf(strptr, "-%hhu", sidptr->authority[i]);
                         strptr = sidstr + strlen(sidstr);
                 }
         }
 
         for (i = 0; i < sidptr->num_subauth; ++i) {
                 saval = le32_to_cpu(sidptr->sub_auth[i]);
-                sprintf(strptr, "-%ld", saval);
+                sprintf(strptr, "-%u", saval);
                 strptr = sidstr + strlen(sidstr);
         }
 }