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xen.14766
5e95af5e-xen-gnttab-Fix-error-path-in-map_grant...
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File 5e95af5e-xen-gnttab-Fix-error-path-in-map_grant_ref.patch of Package xen.14766
Subject: xen/gnttab: Fix error path in map_grant_ref() From: Ross Lagerwall ross.lagerwall@citrix.com Tue Apr 14 15:05:01 2020 +0200 Date: Tue Apr 14 15:05:01 2020 +0200: Git: 52da38987adec9c1f2138d6eb4a1f107744936c1 Part of XSA-295 (c/s 863e74eb2cffb) inadvertently re-positioned the brackets, changing the logic. If the _set_status() call fails, the grant_map hypercall would fail with a status of 1 (rc != GNTST_okay) instead of the expected negative GNTST_* error. This error path can be taken due to bad guest state, and causes net/blk-back in Linux to crash. This is XSA-316. Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Julien Grall <jgrall@amazon.com> master commit: da0c66c8f48042a0186799014af69db0303b1da5 master date: 2020-04-14 14:41:02 +0200 diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c index 95990561da..e272daef5a 100644 --- a/xen/common/grant_table.c +++ b/xen/common/grant_table.c @@ -998,7 +998,7 @@ map_grant_ref( { if ( (rc = _set_status(shah, status, rd, rgt->gt_version, act, op->flags & GNTMAP_readonly, 1, - ld->domain_id) != GNTST_okay) ) + ld->domain_id)) != GNTST_okay ) goto act_release_out; if ( !act->pin )
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