Messages in this thread | | | From | Johannes Thumshirn <> | Subject | Re: [PATCH] lpfc: Fix possible use-after-free and double free in lpfc_mbx_cmpl_rdp_page_a2() | Date | Tue, 18 Aug 2015 08:36:29 +0200 |
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Sebastian Herbszt <herbszt@gmx.de> writes:
> Johannes Thumshirn wrote: >> If the bf_get() call in lpfc_mbx_cmpl_rdp_page_a2() does succeeds, execution >> continues normally and mp gets kfree()d. >> >> If the subsequent call to lpfc_sli_issue_mbox() fails execution jumps to the >> error label where lpfc_mbuf_free() is called with mp->virt and mp->phys as >> function arguments. This is the use after free. Following the use after free mp >> gets kfree()d again which is a double free. > > A similar patch was posted by Colin Ian King on 2015-07-31 [1]. > > [1] http://marc.info/?l=linux-scsi&m=143835937206204&w=2
OK,
Is it already in James' tree (haven't checked)? The problematic code was merged for 4.2-rc1 so if the fix (Collin's or mine I don't care) could go in while we're still in the rc phase, we could avoid all that stable circus.
Thanks for digging this out.
Byte, Johannes
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