usb: rndis_host: Secure rndis_query check against int overflow

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[ Upstream commit c7dd13805f ]

Variables off and len typed as uint32 in rndis_query function
are controlled by incoming RNDIS response message thus their
value may be manipulated. Setting off to a unexpectetly large
value will cause the sum with len and 8 to overflow and pass
the implemented validation step. Consequently the response
pointer will be referring to a location past the expected
buffer boundaries allowing information leakage e.g. via
RNDIS_OID_802_3_PERMANENT_ADDRESS OID.

Fixes: ddda086240 ("USB: rndis_host, various cleanups")
Signed-off-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Szymon Heidrich 2023-01-03 10:17:09 +01:00 • committed by Greg Kroah-Hartman

parent 667ce030bd

commit a713602807

1 changed files with 2 additions and 1 deletions

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drivers/net/usb/rndis_host.c

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