On Tue, 29 Nov 2011 22:00:16 +0100, Christoph Fritz <chf.fritz@xxxxxxxxxxxxxx> wrote:
This patch adds a NULL check for common->curlun in case of an unknown_cmnd
in do_scsi_command().
Did you actually encountered it? check_command() should set curlun, shouldn't it?
After calling check_command() curlun may be NULL only in two situations:
1. check_command() returned negative error code, or
2. we're dealing with INQUIRY or REQUEST_SENSE command.
In the first case, the line in question is not executed at all because of “if
(reply == 0)” check.
In the second case, we won't reach “unknown_cmnd” label because the two commands
have their own case labels and do not perform a goto.
So as far as I can see, common->curlun cannot be NULL in the place this patch
is fixing.
Signed-off-by: Christoph Fritz <chf.fritz@xxxxxxxxxxxxxx>
---
drivers/usb/gadget/f_mass_storage.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index c39d588..0e42027 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -2184,7 +2184,8 @@ unknown_cmnd:
reply = check_command(common, common->cmnd_size,
DATA_DIR_UNKNOWN, 0xff, 0, unknown);
if (reply == 0) {
- common->curlun->sense_data = SS_INVALID_COMMAND;
+ if (common->curlun)
+ common->curlun->sense_data = SS_INVALID_COMMAND;
reply = -EINVAL;
}
break;
--
Best regards, _ _
.o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
..o | Computer Science, Michał “mina86” Nazarewicz (o o)
ooo +----<email/xmpp: mpn@xxxxxxxxxx>--------------ooO--(_)--Ooo--
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