[pve-devel] [PATCH qemu] add fix for iscsi double free issue leading to crashes

[Fiona Ebner]

Reported here[0] and here[1].

[0]: https://gitlab.com/qemu-project/qemu/-/issues/1378
[1]: https://forum.proxmox.com/threads/122776/

Signed-off-by: Fiona Ebner <f.ebner at proxmox.com>
---

Another reentrancy issue ;)

 ...double-free-on-BUSY-or-similar-statu.patch | 32 +++++++++++++++++++
 debian/patches/series                         |  1 +
 2 files changed, 33 insertions(+)
 create mode 100644 debian/patches/extra/0009-block-iscsi-fix-double-free-on-BUSY-or-similar-statu.patch

diff --git a/debian/patches/extra/0009-block-iscsi-fix-double-free-on-BUSY-or-similar-statu.patch b/debian/patches/extra/0009-block-iscsi-fix-double-free-on-BUSY-or-similar-statu.patch
new file mode 100644
index 0000000..fe57e02
--- /dev/null
+++ b/debian/patches/extra/0009-block-iscsi-fix-double-free-on-BUSY-or-similar-statu.patch
@@ -0,0 +1,32 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Paolo Bonzini <pbonzini at redhat.com>
+Date: Tue, 10 Jan 2023 17:36:33 +0100
+Subject: [PATCH] block/iscsi: fix double-free on BUSY or similar statuses
+
+Commit 8c460269aa77 ("iscsi: base all handling of check condition on
+scsi_sense_to_errno", 2019-07-15) removed a "goto out" so that the
+same coroutine is re-entered twice; once from iscsi_co_generic_cb,
+once from the timer callback iscsi_retry_timer_expired.  This can
+cause a crash.
+
+Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1378
+Reported-by: Grzegorz Zdanowski <https://gitlab.com/kiler129>
+Signed-off-by: Paolo Bonzini <pbonzini at redhat.com>
+(cherry-picked from commit 5080152e2ef6cde7aa692e29880c62bd54acb750)
+Signed-off-by: Fiona Ebner <f.ebner at proxmox.com>
+---
+ block/iscsi.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/block/iscsi.c b/block/iscsi.c
+index 3ed4a50c0d..89cd032c3a 100644
+--- a/block/iscsi.c
++++ b/block/iscsi.c
+@@ -268,6 +268,7 @@ iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
+                 timer_mod(&iTask->retry_timer,
+                           qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time);
+                 iTask->do_retry = 1;
++                return;
+             } else if (status == SCSI_STATUS_CHECK_CONDITION) {
+                 int error = iscsi_translate_sense(&task->sense);
+                 if (error == EAGAIN) {
diff --git a/debian/patches/series b/debian/patches/series
index 3ecc9d9..7a85c63 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -6,6 +6,7 @@ extra/0005-vhost-fix-vq-dirty-bitmap-syncing-when-vIOMMU-is-ena.patch
 extra/0006-virtio-rng-pci-fix-migration-compat-for-vectors.patch
 extra/0007-block-fix-detect-zeroes-with-BDRV_REQ_REGISTERED_BUF.patch
 extra/0008-memory-prevent-dma-reentracy-issues.patch
+extra/0009-block-iscsi-fix-double-free-on-BUSY-or-similar-statu.patch
 bitmap-mirror/0001-drive-mirror-add-support-for-sync-bitmap-mode-never.patch
 bitmap-mirror/0002-drive-mirror-add-support-for-conditional-and-always-.patch
 bitmap-mirror/0003-mirror-add-check-for-bitmap-mode-without-bitmap.patch
-- 
2.30.2