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SubjectRe: [PATCH] net/xfrm/xfrm_replay: avoid division by zero
From: Nickolai Zeldovich <>
Date: Thu, 17 Jan 2013 13:58:28 -0500

> All of the xfrm_replay->advance functions in xfrm_replay.c check if
> x->replay_esn->replay_window is zero (and return if so). However,
> one of them, xfrm_replay_advance_bmp(), divides by that value (in the
> '%' operator) before doing the check, which can potentially trigger
> a divide-by-zero exception. Some compilers will also assume that the
> earlier division means the value cannot be zero later, and thus will
> eliminate the subsequent zero check as dead code.
> This patch moves the division to after the check.
> Signed-off-by: Nickolai Zeldovich <>

I'm assuming Steffen will take care of this patch.

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