ath11k: Avoid memcpy() over-reading of he_cap

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In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memcpy(), memmove(), and memset(), avoid
intentionally writing across neighboring array fields.

Since peer_he_cap_{mac,phy}info and he_cap_elem.{mac,phy}_cap_info are not
the same sizes, memcpy() was reading beyond field boundaries. Instead,
correctly cap the copy length and pad out any difference in size
(peer_he_cap_macinfo is 8 bytes whereas mac_cap_info is 6, and
peer_he_cap_phyinfo is 12 bytes whereas phy_cap_info is 11).

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210616195410.1232119-1-keescook@chromium.org

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Kees Cook 2021-06-16 12:54:10 -07:00 • committed by Kalle Valo

parent 49f5b114e3

commit c8bcd82a4e

1 changed files with 10 additions and 4 deletions

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drivers/net/wireless/ath/ath11k/mac.c

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