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Message-ID: <20120718103818.7720.52927.stgit@localhost.localdomain> Date: Wed, 18 Jul 2012 16:08:18 +0530 From: "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> To: fweisbec@...il.com, benh@...nel.crashing.org, paulus@...ba.org, prasad.krishnan@...il.com Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, emachado@...ux.vnet.ibm.com Subject: [PATCH RESEND] PPC Hardware Breakpoints: Fix incorrect pointer access If arch_validate_hwbkpt_settings() fails, bp->ctx won't be valid and the kernel panics. Add a check to fix this. Reported-by: Edjunior Barbosa Machado <emachado@...ux.vnet.ibm.com> Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com> --- arch/powerpc/kernel/hw_breakpoint.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c index 2bc0584..f3a82dd 100644 --- a/arch/powerpc/kernel/hw_breakpoint.c +++ b/arch/powerpc/kernel/hw_breakpoint.c @@ -111,7 +111,7 @@ void arch_unregister_hw_breakpoint(struct perf_event *bp) * and the single_step_dabr_instruction(), then cleanup the breakpoint * restoration variables to prevent dangling pointers. */ - if (bp->ctx->task) + if (bp->ctx && bp->ctx->task) bp->ctx->task->thread.last_hit_ubp = NULL; } -- 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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