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Blackfin arch: have is_user_addr_valid() check for overflows (like when address is -1) 

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Mike Frysinger 2008-10-10 17:12:51 +08:00 committed by Bryan Wu
parent d207a8c768
commit 3c08f1d122
1 changed files with 4 additions and 0 deletions
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4
arch/blackfin/kernel/ptrace.c
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@ -160,6 +160,10 @@ static inline int is_user_addr_valid(struct task_struct *child,
struct vm_list_struct *vml; struct vm_list_struct *vml;
struct sram_list_struct *sraml; struct sram_list_struct *sraml;
/* overflow */
if (start + len < start)
return -EIO;
for (vml = child->mm->context.vmlist; vml; vml = vml->next) for (vml = child->mm->context.vmlist; vml; vml = vml->next)
if (start >= vml->vma->vm_start && start + len < vml->vma->vm_end) if (start >= vml->vma->vm_start && start + len < vml->vma->vm_end)
return 0; return 0;