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;
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