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| author | David S. Miller <davem@davemloft.net> | 2008-06-17 23:53:22 -0700 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-06-24 15:48:56 -0500 |
| commit | eadc49b1a8d09480f14caea292142f103a89c77a (patch) | |
| tree | ed78a3cfdd22e9754eaadcd1c73c5edd2d03cf5b /drivers/scsi/esp_scsi.c | |
| parent | c95e62ce8905aab62fed224eaaa9b8558a0ef652 (diff) | |
| download | lwn-eadc49b1a8d09480f14caea292142f103a89c77a.tar.gz lwn-eadc49b1a8d09480f14caea292142f103a89c77a.zip | |
[SCSI] esp: Fix OOPS in esp_reset_cleanup().
OOPS reported by Friedrich Oslage <bluebird@porno-bullen.de>
The problem here is that tp->starget is set every time a lun
is allocated for a particular target so we can catch the
sdev_target parent value.
The reset handler uses the NULL'ness of this value to determine
which targets are active.
But esp_slave_destroy() does not NULL out this value when appropriate.
So for every target that doesn't respond, the SCSI bus scan causes
a stale pointer to be left here, with ensuing crashes like you're
seeing.
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/esp_scsi.c')
| -rw-r--r-- | drivers/scsi/esp_scsi.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c index a0b6d414953d..305eddef5ca1 100644 --- a/drivers/scsi/esp_scsi.c +++ b/drivers/scsi/esp_scsi.c @@ -2371,6 +2371,7 @@ static int esp_slave_alloc(struct scsi_device *dev) dev->hostdata = lp; tp->starget = dev->sdev_target; + tp->starget_ref++; spi_min_period(tp->starget) = esp->min_period; spi_max_offset(tp->starget) = 15; @@ -2425,10 +2426,17 @@ static int esp_slave_configure(struct scsi_device *dev) static void esp_slave_destroy(struct scsi_device *dev) { + struct esp *esp = shost_priv(dev->host); + struct esp_target_data *tp = &esp->target[dev->id]; struct esp_lun_data *lp = dev->hostdata; kfree(lp); dev->hostdata = NULL; + + BUG_ON(tp->starget_ref <= 0); + + if (!--tp->starget_ref) + tp->starget = NULL; } static int esp_eh_abort_handler(struct scsi_cmnd *cmd) |