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| author | Manjunath Patil <manjunath.b.patil@oracle.com> | 2018-10-30 19:49:21 +0300 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2018-11-06 12:33:36 +0300 |
| commit | 6cc4a0863c9709c512280c64e698d68443ac8053 (patch) | |
| tree | dc10a971c18a294f2fed2dcbdfb5fd89d0977bc9 /arch/x86/xen/p2m.c | |
| parent | d9cccfa7c4d1d9ef967ec9308df7304a18609b30 (diff) | |
| download | linux-6cc4a0863c9709c512280c64e698d68443ac8053.tar.xz | |
xen-blkfront: fix kernel panic with negotiate_mq error path
info->nr_rings isn't adjusted in case of ENOMEM error from
negotiate_mq(). This leads to kernel panic in error path.
Typical call stack involving panic -
#8 page_fault at ffffffff8175936f
[exception RIP: blkif_free_ring+33]
RIP: ffffffffa0149491 RSP: ffff8804f7673c08 RFLAGS: 00010292
...
#9 blkif_free at ffffffffa0149aaa [xen_blkfront]
#10 talk_to_blkback at ffffffffa014c8cd [xen_blkfront]
#11 blkback_changed at ffffffffa014ea8b [xen_blkfront]
#12 xenbus_otherend_changed at ffffffff81424670
#13 backend_changed at ffffffff81426dc3
#14 xenwatch_thread at ffffffff81422f29
#15 kthread at ffffffff810abe6a
#16 ret_from_fork at ffffffff81754078
Cc: stable@vger.kernel.org
Fixes: 7ed8ce1c5fc7 ("xen-blkfront: move negotiate_mq to cover all cases of new VBDs")
Signed-off-by: Manjunath Patil <manjunath.b.patil@oracle.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'arch/x86/xen/p2m.c')
0 files changed, 0 insertions, 0 deletions