scsi-generic scsi_read_complete() should not -both- call the client
complete callback with SCSI_REASON_DATA -and- call
scsi_command_complete(). The former will cause the client to queue a
new read or write request, while the later will free the request data
structure, thus causing the new read or write request to use a
freed/stale structure when it completes.
This patch fixes the bug, fixing a crash with scsi-generic & RHEL5.5
installer.
Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Cc: David Gibson <da...@gibson.dropbear.id.au>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Reviewed-by: Christoph Hellwig <h...@lst.de>
---
hw/scsi-generic.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/hw/scsi-generic.c b/hw/scsi-generic.c
index 9be1cca..102f1da 100644
--- a/hw/scsi-generic.c
+++ b/hw/scsi-generic.c
@@ -172,9 +172,11 @@ static void scsi_read_complete(void * opaque, int ret)
DPRINTF("Data ready tag=0x%x len=%d\n", r->req.tag, len);
r->len = -1;
- r->req.bus->complete(r->req.bus, SCSI_REASON_DATA, r->req.tag, len);
- if (len == 0)
+ if (len == 0) {
scsi_command_complete(r, 0);
+ } else {
+ r->req.bus->complete(r->req.bus, SCSI_REASON_DATA, r->req.tag, len);
+ }
}
/* Read more data from scsi device into buffer. */
--
1.7.4.4
