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___kfree(): disregard NULL pointer argument

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Balazs Gerofi
2017-02-25 14:28:15 +09:00
parent 32c8f6192d
commit 5a4148aaaf
1 changed files with 8 additions and 3 deletions
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11
kernel/mem.c
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@@ -1868,9 +1868,14 @@ split_and_return:
static void ___kfree(void *ptr) static void ___kfree(void *ptr)
{ {
struct kmalloc_header *chunk = struct kmalloc_header *chunk;
(struct kmalloc_header*)(ptr - sizeof(struct kmalloc_header)); unsigned long kmalloc_irq_flags;
unsigned long kmalloc_irq_flags = cpu_disable_interrupt_save();
if (!ptr)
return;
chunk = (struct kmalloc_header*)(ptr - sizeof(struct kmalloc_header));
kmalloc_irq_flags = cpu_disable_interrupt_save();
/* Sanity check */ /* Sanity check */
if (chunk->front_magic != 0x5c5c5c5c || chunk->end_magic != 0x6d6d6d6d) { if (chunk->front_magic != 0x5c5c5c5c || chunk->end_magic != 0x6d6d6d6d) {