[PATCH] unlocked access to task->comm

Looking at  get_task_comm patch:
http://linus.bkbits.net:8080/linux-2.5/patch@1.1803.144.3

There is one other place where task->comm is accessed outside current.
There are two issues.  The code is trying to copy to temp space without
task_lock.  It is not using temp space for actual user copy.

Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/mips/kernel/sysirix.c

@@ -287,9 +287,9 @@ asmlinkage int irix_syssgi(struct pt_regs *regs)
 		int pid = (int) regs->regs[base + 5];
 		char *buf = (char *) regs->regs[base + 6];
 		struct task_struct *p;
-		char comm[16];
+		char tcomm[sizeof(current->comm)];
 
-		retval = verify_area(VERIFY_WRITE, buf, 16);
+		retval = verify_area(VERIFY_WRITE, buf, sizeof(tcomm));
 		if (retval)
 			break;
 		read_lock(&tasklist_lock);
@@ -299,11 +299,11 @@ asmlinkage int irix_syssgi(struct pt_regs *regs)
 			retval = -ESRCH;
 			break;
 		}
-		memcpy(comm, p->comm, 16);
+		get_task_comm(tcomm, p);
 		read_unlock(&tasklist_lock);
 
 		/* XXX Need to check sizes. */
-		copy_to_user(buf, p->comm, 16);
+		copy_to_user(buf, tcomm, sizeof(tcomm));
 		retval = 0;
 		break;
 	}