From: Colin Ian King Date: Thu, 6 Jul 2017 15:06:32 +0000 (+0100) Subject: usb: storage: return on error to avoid a null pointer dereference X-Git-Tag: v4.13-rc2~7^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=446230f52a5bef593554510302465eabab45a372;p=platform%2Fkernel%2Flinux-exynos.git usb: storage: return on error to avoid a null pointer dereference 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 Cc: stable Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/storage/isd200.c b/drivers/usb/storage/isd200.c index fba4005..6a7720e 100644 --- a/drivers/usb/storage/isd200.c +++ b/drivers/usb/storage/isd200.c @@ -1529,8 +1529,11 @@ 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 */