usb: f_fs: Clear OS Extended descriptor counts to zero in ffs_data_reset()
For userspace functions using OS Descriptors, if a function also supplies Extended Property descriptors currently the counts and lengths stored in the ms_os_descs_ext_prop_{count,name_len,data_len} variables are not getting reset to 0 during an unbind or when the epfiles are closed. If the same function is re-bound and the descriptors are re-written, this results in those count/length variables to monotonically increase causing the VLA allocation in _ffs_func_bind() to grow larger and larger at each bind/unbind cycle and eventually fail to allocate. Fix this by clearing the ms_os_descs_ext_prop count & lengths to 0 in ffs_data_reset(). Change-Id: I3b292fe5386ab54b53df2b9f15f07430dc3df24a Fixes: f0175ab5 ("usb: gadget: f_fs: OS descriptors support") Cc: stable@vger.kernel.org Signed-off-by:Udipto Goswami <ugoswami@codeaurora.org>
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