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Date: Sun, 8 Jul 2012 22:30:06 +0200 From: Oleg Nesterov <oleg@...hat.com> To: Ingo Molnar <mingo@...e.hu>, Srikar Dronamraju <srikar@...ux.vnet.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>, Anton Arapov <anton@...hat.com>, Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org Subject: [PATCH 3/5] uprobes: fix overflow in vma_address/find_active_uprobe vma->vm_pgoff is "unsigned long", it should be promoted to loff_t before the multiplication to avoid the overflow. Signed-off-by: Oleg Nesterov <oleg@...hat.com> --- kernel/events/uprobes.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 47c4e24..3826b3b 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -117,7 +117,7 @@ static loff_t vma_address(struct vm_area_struct *vma, loff_t offset) loff_t vaddr; vaddr = vma->vm_start + offset; - vaddr -= vma->vm_pgoff << PAGE_SHIFT; + vaddr -= (loff_t)vma->vm_pgoff << PAGE_SHIFT; return vaddr; } @@ -1450,7 +1450,7 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp) inode = vma->vm_file->f_mapping->host; offset = bp_vaddr - vma->vm_start; - offset += (vma->vm_pgoff << PAGE_SHIFT); + offset += ((loff_t)vma->vm_pgoff << PAGE_SHIFT); uprobe = find_uprobe(inode, offset); } -- 1.5.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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