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arch/blackfin: Add kmalloc NULL tests

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Check that the result of kmalloc is not NULL before passing it to other
functions.

In the first two cases, the new code returns -ENOMEM, which seems
compatible with what is done for similar functions for other architectures.

In the last two cases, the new code fails silently, ie just returns,
because the function has void return type.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression *x;
identifier f;
constant char *C;
@@

x = \(kmalloc\|kcalloc\|kzalloc\)(...);
... when != x == NULL
    when != x != NULL
    when != (x || ...)
(
kfree(x)
|
f(...,C,...,x,...)
|
*f(...,x,...)
|
*x->f
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Julia Lawall 2009-07-14 03:15:19 +00:00 committed by Mike Frysinger
parent 5bc6e3cfe6
commit 994e9a2e01
1 changed files with 8 additions and 0 deletions
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8
arch/blackfin/mach-common/smp.c
View file

@ -211,6 +211,8 @@ int smp_call_function(void (*func)(void *info), void *info, int wait)
return 0;
msg = kmalloc(sizeof(*msg), GFP_ATOMIC);
if (!msg)
return -ENOMEM;
INIT_LIST_HEAD(&msg->list);
msg->call_struct.func = func;
msg->call_struct.info = info;
@ -252,6 +254,8 @@ int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
cpu_set(cpu, callmap);
msg = kmalloc(sizeof(*msg), GFP_ATOMIC);
if (!msg)
return -ENOMEM;
INIT_LIST_HEAD(&msg->list);
msg->call_struct.func = func;
msg->call_struct.info = info;
@ -287,6 +291,8 @@ void smp_send_reschedule(int cpu)
return;
msg = kmalloc(sizeof(*msg), GFP_ATOMIC);
if (!msg)
return;
memset(msg, 0, sizeof(msg));
INIT_LIST_HEAD(&msg->list);
msg->type = BFIN_IPI_RESCHEDULE;
@ -314,6 +320,8 @@ void smp_send_stop(void)
return;
msg = kmalloc(sizeof(*msg), GFP_ATOMIC);
if (!msg)
return;
memset(msg, 0, sizeof(msg));
INIT_LIST_HEAD(&msg->list);
msg->type = BFIN_IPI_CPU_STOP;