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Subject[patch v2] usb: f_fs: off by one bug in _ffs_func_bind()
This loop is supposed to set all the .num[] values to -1 but it's off by
one so it skips the first element and sets one element past the end of
the array.

I've cleaned up the loop a little as well.

Fixes: ddf8abd25994 ('USB: f_fs: the FunctionFS driver')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
v2: move the eps_ptr assignment outside the loop.

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 73515d5..d26eb64 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2729,6 +2729,7 @@ static int _ffs_func_bind(struct usb_configuration *c,
func->ffs->ss_descs_count;

int fs_len, hs_len, ss_len, ret, i;
+ struct ffs_ep *eps_ptr;

/* Make it a single chunk, less management later on */
vla_group(d);
@@ -2777,12 +2778,9 @@ static int _ffs_func_bind(struct usb_configuration *c,
ffs->raw_descs_length);

memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz);
- for (ret = ffs->eps_count; ret; --ret) {
- struct ffs_ep *ptr;
-
- ptr = vla_ptr(vlabuf, d, eps);
- ptr[ret].num = -1;
- }
+ eps_ptr = vla_ptr(vlabuf, d, eps);
+ for (i = 0; i < ffs->eps_count; i++)
+ eps_ptr[i].num = -1;

/* Save pointers
* d_eps == vlabuf, func->eps used to kfree vlabuf later
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