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| author | Ronnie Sahlberg <ronniesahlberg@gmail.com> | 2013-06-23 08:07:08 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2013-07-17 17:00:26 +0200 |
| commit | 0a53f010745635c39a83756a948df60a84e88fe5 (patch) | |
| tree | 10442fb89a1afd83e7e287d7652285f56afbb43f | |
| parent | 6453a3a69488196f26d12654c6b148446abdf3d6 (diff) | |
| download | qemu-0a53f010745635c39a83756a948df60a84e88fe5.tar.gz qemu-0a53f010745635c39a83756a948df60a84e88fe5.tar.bz2 qemu-0a53f010745635c39a83756a948df60a84e88fe5.zip | |
Fix iSCSI crash on SG_IO with an iovector
Don't assume that SG_IO is always invoked with a simple buffer,
check the iovec_count and if it is >= 1 then we need to pass an array
of iovectors to libiscsi instead of just a plain buffer.
Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | block/iscsi.c | 51 |
1 files changed, 44 insertions, 7 deletions
diff --git a/block/iscsi.c b/block/iscsi.c index 0bbf0b18b4..fa5252cc40 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -32,6 +32,7 @@ #include "block/block_int.h" #include "trace.h" #include "block/scsi.h" +#include "qemu/iov.h" #include <iscsi/iscsi.h> #include <iscsi/scsi-lowlevel.h> @@ -651,6 +652,9 @@ iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, { IscsiAIOCB *acb = opaque; + g_free(acb->buf); + acb->buf = NULL; + if (acb->canceled != 0) { return; } @@ -727,14 +731,30 @@ static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); acb->task->expxferlen = acb->ioh->dxfer_len; + data.size = 0; if (acb->task->xfer_dir == SCSI_XFER_WRITE) { - data.data = acb->ioh->dxferp; - data.size = acb->ioh->dxfer_len; + if (acb->ioh->iovec_count == 0) { + data.data = acb->ioh->dxferp; + data.size = acb->ioh->dxfer_len; + } else { +#if defined(LIBISCSI_FEATURE_IOVECTOR) + scsi_task_set_iov_out(acb->task, + (struct scsi_iovec *) acb->ioh->dxferp, + acb->ioh->iovec_count); +#else + struct iovec *iov = (struct iovec *)acb->ioh->dxferp; + + acb->buf = g_malloc(acb->ioh->dxfer_len); + data.data = acb->buf; + data.size = iov_to_buf(iov, acb->ioh->iovec_count, 0, + acb->buf, acb->ioh->dxfer_len); +#endif + } } + if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, iscsi_aio_ioctl_cb, - (acb->task->xfer_dir == SCSI_XFER_WRITE) ? - &data : NULL, + (data.size > 0) ? &data : NULL, acb) != 0) { scsi_free_scsi_task(acb->task); qemu_aio_release(acb); @@ -743,9 +763,26 @@ static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, /* tell libiscsi to read straight into the buffer we got from ioctl */ if (acb->task->xfer_dir == SCSI_XFER_READ) { - scsi_task_add_data_in_buffer(acb->task, - acb->ioh->dxfer_len, - acb->ioh->dxferp); + if (acb->ioh->iovec_count == 0) { + scsi_task_add_data_in_buffer(acb->task, + acb->ioh->dxfer_len, + acb->ioh->dxferp); + } else { +#if defined(LIBISCSI_FEATURE_IOVECTOR) + scsi_task_set_iov_in(acb->task, + (struct scsi_iovec *) acb->ioh->dxferp, + acb->ioh->iovec_count); +#else + int i; + for (i = 0; i < acb->ioh->iovec_count; i++) { + struct iovec *iov = (struct iovec *)acb->ioh->dxferp; + + scsi_task_add_data_in_buffer(acb->task, + iov[i].iov_len, + iov[i].iov_base); + } +#endif + } } iscsi_set_events(iscsilun); |