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[Qemu-devel] [PATCH 3/5] pr-manager-helper: avoid SIGSEGV when writing t
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 3/5] pr-manager-helper: avoid SIGSEGV when writing to the socket fail |
Date: |
Tue, 26 Jun 2018 17:40:26 +0200 |
When writing to the qemu-pr-helper socket failed, the persistent
reservation manager was correctly disconnecting the socket, but it
did not clear pr_mgr->ioc. So the rest of the code did not know
that the socket had been disconnected, accessed pr_mgr->ioc and
happily caused a crash.
To reproduce, it is enough to stop qemu-pr-helper between QEMU
startup and executing e.g. sg_persist -k /dev/sdb.
Signed-off-by: Paolo Bonzini <address@hidden>
---
scsi/pr-manager-helper.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/scsi/pr-manager-helper.c b/scsi/pr-manager-helper.c
index 82ff6b6123..0c0fe389b7 100644
--- a/scsi/pr-manager-helper.c
+++ b/scsi/pr-manager-helper.c
@@ -71,6 +71,7 @@ static int pr_manager_helper_write(PRManagerHelper *pr_mgr,
if (n_written <= 0) {
assert(n_written != QIO_CHANNEL_ERR_BLOCK);
object_unref(OBJECT(pr_mgr->ioc));
+ pr_mgr->ioc = NULL;
return n_written < 0 ? -EINVAL : 0;
}
--
2.17.1
[Qemu-devel] [PATCH 2/5] pr-helper: fix assertion failure on failed multipath PERSISTENT RESERVE IN, Paolo Bonzini, 2018/06/26