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FROMGIT: usb: gadget: Fix double free of device descriptor pointers

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Upon driver unbind usb_free_all_descriptors() function frees all
speed descriptor pointers without setting them to NULL. In case
gadget speed changes (i.e from super speed plus to super speed)
after driver unbind only upto super speed descriptor pointers get
populated. Super speed plus desc still holds the stale (already
freed) pointer. Fix this issue by setting all descriptor pointers
to NULL after freeing them in usb_free_all_descriptors().

Fixes: f5c61225cf ("usb: gadget: Update function for SuperSpeedPlus")
cc: stable@vger.kernel.org
Reviewed-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
Link: https://lore.kernel.org/r/1619034452-17334-1-git-send-email-wcheng@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 43c4cab006
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-next)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I24ed655c590ebe82f8e665882acdc4b0e4c1d9a9
This commit is contained in:
Hemant Kumar 2021-04-21 12:47:32 -07:00 • committed by Greg Kroah-Hartman
commit fcd2a56bb0
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/gadget/config.c
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@ -194,9 +194,13 @@ EXPORT_SYMBOL_GPL(usb_assign_descriptors);
void usb_free_all_descriptors(struct usb_function *f)
{
usb_free_descriptors(f->fs_descriptors);
f->fs_descriptors = NULL;
usb_free_descriptors(f->hs_descriptors);
f->hs_descriptors = NULL;
usb_free_descriptors(f->ss_descriptors);
f->ss_descriptors = NULL;
usb_free_descriptors(f->ssp_descriptors);
f->ssp_descriptors = NULL;
}
EXPORT_SYMBOL_GPL(usb_free_all_descriptors);