Date: Wed, 29 Aug 2018 15:55:26 +0000 (UTC) From: Stephen Hurd <shurd@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r338372 - head/sys/net Message-ID: <201808291555.w7TFtQKM065591@repo.freebsd.org>
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Author: shurd Date: Wed Aug 29 15:55:25 2018 New Revision: 338372 URL: https://svnweb.freebsd.org/changeset/base/338372 Log: Fix potential data corruption in iflib The MP ring may have txq pointers enqueued. Previously, these were passed to m_free() when IFC_QFLUSH was set. This patch checks for the value and doesn't call m_free(). Reviewed by: gallatin Approved by: re (gjb) Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D16882 Modified: head/sys/net/iflib.c Modified: head/sys/net/iflib.c ============================================================================== --- head/sys/net/iflib.c Wed Aug 29 14:01:27 2018 (r338371) +++ head/sys/net/iflib.c Wed Aug 29 15:55:25 2018 (r338372) @@ -3636,7 +3636,8 @@ iflib_txq_drain(struct ifmp_ring *r, uint32_t cidx, ui if (__predict_false(ctx->ifc_flags & IFC_QFLUSH)) { DBG_COUNTER_INC(txq_drain_flushing); for (i = 0; i < avail; i++) { - m_free(r->items[(cidx + i) & (r->size-1)]); + if (__predict_true(r->items[(cidx + i) & (r->size-1)] != (void *)txq) + m_free(r->items[(cidx + i) & (r->size-1)]); r->items[(cidx + i) & (r->size-1)] = NULL; } return (avail);
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