[PATCH] fix sys_prctl() returned uninitialized value

From: Shi Weihua
Date: Wed May 21 2008 - 23:20:58 EST

When we test kernel by the latest LTP(20080430) on ia64,
the following failure occured:
prctl01 1 PASS : Test Passed
prctl01 0 WARN : prctl() returned 2048 errno = 0 : Success
prctl01 1 PASS : Test Passed
prctl01 2 FAIL : Test Failed

We found commit 3898b1b4ebff8dcfbcf1807e0661585e06c9a91c
causes this failure by git-bisect.
And, we found 'error' has not been initialized in the function
sys_prctl()(kernel/sys.c). When the capability module is not taking
responsibility for this call, sys_prctl() may return a wrong value.

Now, i fixed it.

Signed-off-by: Shi Weihua <shiwh@xxxxxxxxxxxxxx>
diff --git a/kernel/sys.c b/kernel/sys.c
index 895d2d4..26eb0f7 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1652,7 +1652,7 @@ asmlinkage long sys_umask(int mask)
asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5)
- long uninitialized_var(error);
+ long error = 0;

if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error))
return error;

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