diff options
| author | Colin Ian King <colin.king@canonical.com> | 2017-07-06 16:06:32 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-27 15:06:05 -0700 |
| commit | ab8e00991809b2c5953fa49c967df14532542183 (patch) | |
| tree | e29c96f638980a7c938d4a6b0b0d291e24bee501 | |
| parent | f883b509b48ba07cc52b6cd3d32c84b99f323487 (diff) | |
usb: storage: return on error to avoid a null pointer dereference
commit 446230f52a5bef593554510302465eabab45a372 upstream.
When us->extra is null the driver is not initialized, however, a
later call to osd200_scsi_to_ata is made that dereferences
us->extra, causing a null pointer dereference. The code
currently detects and reports that the driver is not initialized;
add a return to avoid the subsequent dereference issue in this
check.
Thanks to Alan Stern for pointing out that srb->result needs setting
to DID_ERROR << 16
Detected by CoverityScan, CID#100308 ("Dereference after null check")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/storage/isd200.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/usb/storage/isd200.c b/drivers/usb/storage/isd200.c index 39afd7045c43..7bb5f8da5357 100644 --- a/drivers/usb/storage/isd200.c +++ b/drivers/usb/storage/isd200.c @@ -1520,8 +1520,11 @@ static void isd200_ata_command(struct scsi_cmnd *srb, struct us_data *us) /* Make sure driver was initialized */ - if (us->extra == NULL) + if (us->extra == NULL) { usb_stor_dbg(us, "ERROR Driver not initialized\n"); + srb->result = DID_ERROR << 16; + return; + } scsi_set_resid(srb, 0); /* scsi_bufflen might change in protocol translation to ata */ |