usb: gadget: f_mass_storage: Fix NULL dereference in fsg_add()

fsg_common_init() can fail when memory is low. In that case, it returns
PTR_ERR().
fsg_add() does not check for failure, and thus dereferences an invalid
fsg_common later, which crashes.

Verify if we receive an error from fsg_common_init() and handle it
gracefully.

Reported-by: Zixun LI <[email protected]>
Signed-off-by: Mattijs Korpershoek <[email protected]>
Tested-by: Zixun LI <[email protected]> # on SAM9X60
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mattijs Korpershoek <[email protected]>

0 files changed, 0 insertions, 0 deletions