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[SCSI] bsg: correct fault if queue object removed while dev_t open 

This patch corrects an issue in bsg that results in a general protection
fault if an LLD is removed while an application is using an open file
handle to a bsg device, and the application issues an ioctl. The fault
occurs because the class_dev is NULL, having been cleared in
bsg_unregister_queue() when the driver was removed.  With this
patch, a check is made for the class_dev, and the application
will receive ENXIO if the related object is gone.

Signed-off-by: Carl Lajeunesse <carl.lajeunesse@emulex.com>
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
James Smart 2010-11-14 11:12:04 -05:00 committed by James Bottomley
parent 057f02a38e
commit c7a841f3ac
1 changed files with 8 additions and 0 deletions
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8
block/bsg.c
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@ -250,6 +250,14 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm,
int ret, rw;
unsigned int dxfer_len;
void *dxferp = NULL;
struct bsg_class_device *bcd = &q->bsg_dev;
/* if the LLD has been removed then the bsg_unregister_queue will
* eventually be called and the class_dev was freed, so we can no
* longer use this request_queue. Return no such address.
*/
if (!bcd->class_dev)
return ERR_PTR(-ENXIO);
dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp,
hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp,