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Date:   Fri,  1 May 2020 15:21:52 +0200
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Udipto Goswami <>,
        Sriharsha Allenki <>,
        Manu Gautam <>
Subject: [PATCH 4.9 58/80] usb: f_fs: Clear OS Extended descriptor counts to zero in ffs_data_reset()

From: Udipto Goswami <>

commit 1c2e54fbf1da5e5445a0ab132c862b02ccd8d230 upstream.

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

Fixes: f0175ab51993 ("usb: gadget: f_fs: OS descriptors support")
Signed-off-by: Udipto Goswami <>
Signed-off-by: Sriharsha Allenki <>
Reviewed-by: Manu Gautam <>
Signed-off-by: Greg Kroah-Hartman <>

 drivers/usb/gadget/function/f_fs.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -1701,6 +1701,10 @@ static void ffs_data_reset(struct ffs_da
 	ffs->state = FFS_READ_DESCRIPTORS;
 	ffs->setup_state = FFS_NO_SETUP;
 	ffs->flags = 0;
+	ffs->ms_os_descs_ext_prop_count = 0;
+	ffs->ms_os_descs_ext_prop_name_len = 0;
+	ffs->ms_os_descs_ext_prop_data_len = 0;

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