wifi: libertas: fix integer underflow in process_cmdrequest()

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The existing validation only checks if recvlength exceeds
LBS_CMD_BUFFER_SIZE, but doesn't check the lower bound. When a
USB device sends a response shorter than MESSAGE_HEADER_LEN, the
subtraction (recvlength - MESSAGE_HEADER_LEN) wraps to a huge
value, causing memcpy to corrupt the heap.
Add the same lower bound check that libertas_tf already has.

Signed-off-by: Amir Mohammad Jahangirzad <a.jahangirzad@gmail.com>
Link: https://patch.msgid.link/20260418004247.368944-1-a.jahangirzad@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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Amir Mohammad Jahangirzad 2026-04-18 04:12:47 +03:30 • committed by Johannes Berg

parent a035766f97

commit 3994b4afd5

1 changed files with 3 additions and 2 deletions

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drivers/net/wireless/marvell/libertas/if_usb.c

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