USB: gadget: inode: fix mm lifetime handling

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priv stores a pointer to the submitting task's mm_struct,
but does not currently hold a reference to it while async
requests are pending.

This can result in a use-after-free if the task exits before
completion handling finishes.

Take a reference with mmgrab() when queuing the read request
and release it with mmdrop() on request completion.

Reported-by: Gabriel Prostitis <prostitisgabriel@gmail.com>
Signed-off-by: Gabriel Prostitis <prostitisgabriel@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://patch.msgid.link/20260601-mm-uaf-fix-v2-2-3c942a707bce@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Gabriel Prostitis 2026-06-01 08:44:11 +02:00 • committed by Greg Kroah-Hartman

parent 5eb5c72c72

commit a1c33c80e1

1 changed files with 13 additions and 4 deletions

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17

drivers/usb/gadget/legacy/inode.c

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