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fs/exec.c:__bprm_mm_init(): clean up error handling

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Untangle the error unwinding in this function, saving a test of local
variable `vma'.

Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Luiz Fernando N. Capitulino 2009-01-06 14:40:44 -08:00 committed by Linus Torvalds
parent bca1033b09
commit eaccbfa564
1 changed files with 6 additions and 14 deletions
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20
fs/exec.c
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@ -232,13 +232,13 @@ static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos,
static int __bprm_mm_init(struct linux_binprm *bprm)
{
int err = -ENOMEM;
int err;
struct vm_area_struct *vma = NULL;
struct mm_struct *mm = bprm->mm;
bprm->vma = vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
if (!vma)
goto err;
return -ENOMEM;
down_write(&mm->mmap_sem);
vma->vm_mm = mm;
@ -251,28 +251,20 @@ static int __bprm_mm_init(struct linux_binprm *bprm)
*/
vma->vm_end = STACK_TOP_MAX;
vma->vm_start = vma->vm_end - PAGE_SIZE;
vma->vm_flags = VM_STACK_FLAGS;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
err = insert_vm_struct(mm, vma);
if (err) {
up_write(&mm->mmap_sem);
if (err)
goto err;
}
mm->stack_vm = mm->total_vm = 1;
up_write(&mm->mmap_sem);
bprm->p = vma->vm_end - sizeof(void *);
return 0;
err:
if (vma) {
bprm->vma = NULL;
kmem_cache_free(vm_area_cachep, vma);
}
up_write(&mm->mmap_sem);
bprm->vma = NULL;
kmem_cache_free(vm_area_cachep, vma);
return err;
}