[CIFS] Reduce cifs stack space usage

The two cifs functions that used the most stack according
to "make checkstack" have been changed to use less stack.

Thanks to jra and Shaggy for helpful ideas

Signed-off-by: Steve French <sfrench@us.ibm.com>
cc: jra@samba.org
cc: shaggy@us.ibm.com

1 files changed, 7 insertions, 1 deletions

diff --git a/fs/cifs/smbdes.c b/fs/cifs/smbdes.c
index 7a1b2b961ec8..1a4a395c9376 100644
--- a/fs/cifs/smbdes.c
+++ b/fs/cifs/smbdes.c
@@ -196,7 +196,7 @@ dohash(char *out, char *in, char *key, int forw)
         char c[28];
         char d[28];
         char *cd;
-        char ki[16][48];
+        char (*ki)[48];
         char *pd1;
         char l[32], r[32];
         char *rl;
@@ -206,6 +206,10 @@ dohash(char *out, char *in, char *key, int forw)
         if(pk1 == NULL)
                 return;
 
+        ki = kmalloc(16*48, GFP_KERNEL);
+        if(ki == NULL)
+                return;
+
         cd = pk1 + 56;
         pd1= cd  + 56;
         rl = pd1 + 64;
@@ -243,6 +247,7 @@ dohash(char *out, char *in, char *key, int forw)
                 er = kmalloc(48+48+32+32+32, GFP_KERNEL);
                 if(er == NULL) {
                         kfree(pk1);
+                        kfree(ki);
                         return;
                 }
                 erk = er+48;
@@ -290,6 +295,7 @@ dohash(char *out, char *in, char *key, int forw)
 
         permute(out, rl, perm6, 64);
         kfree(pk1);
+        kfree(ki);
 }
 
 static void