CVE-2019-15213

media: dvb: usb: use after free in dvb_usb_device_exit

References

Notes

 bwh> This is supposed to be fixed by commit 6cf97230cd5f "media: dvb:
 bwh> usb: fix use after free in dvb_usb_device_exit", but that won't fix
 bwh> the syzkaller report it claims to.  The KASAN output shows an 8-byte
 bwh> access to memory that was allocated in dw2102_probe(), apparently by
 bwh> the statement "s421 = kmemdup(...)".  But it was also freed by
 bwh> dw2102_probe(), so d->desc was already a dangling pointer before
 bwh> dvb_usb_device_exit() was called.
 bwh> The name strings seem to be static data that are only freed when
 bwh> the module containing them is unloaded.  Which dvb_usb_device_exit()
 bwh> doesn't do.
 bwh> Introduced in 4.19 by commit 299c7007e936 "media: dw2102: Fix
 bwh> memleak on sequence of probes".

Bugs

Status

Branch Status
4.19-buster-security needed
4.19-upstream-stable needed
5.10-bullseye-security needed
5.10-upstream-stable needed
6.1-bookworm-security needed
6.1-upstream-stable needed
6.6-upstream-stable unknown
6.8-upstream-stable unknown
sid needed
upstream needed