ALSA: asihpi: fix a potential double-fetch bug when copying puhm

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The hm->h.size is intended to hold the actual size of the hm struct
that is copied from userspace and should always be <= sizeof(*hm).

However, after copy_from_user(hm, puhm, hm->h.size), since userspace
process has full control over the memory region pointed by puhm, it is
possible that the value of hm->h.size is different from what is fetched-in
previously (get_user(hm->h.size, (u16 __user *)puhm)). In other words,
hm->h.size is overriden and the relation between hm->h.size and the hm
struct is broken.

This patch proposes to use a seperate variable, msg_size, to hold
the value of the first fetch and override hm->h.size to msg_size
after the second fetch to maintain the relation.

Signed-off-by: Meng Xu <mengxu.gatech@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

...

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Meng Xu 2017-09-19 01:21:56 -04:00 • committed by Takashi Iwai

parent a931b9ce93

commit e1af344df4

1 changed files with 8 additions and 4 deletions

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sound/pci/asihpi/hpioctl.c

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