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Change History

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: Set n_channels after allocating struct cfg80211_scan_request

Make sure that n_channels is set after allocating the
struct cfg80211_registered_device::int_scan_req member. Seen with
syzkaller:

UBSAN: array-index-out-of-bounds in net/mac80211/scan.c:1208:5
index 0 is out of range for type 'struct ieee80211_channel *[] __counted_by(n_channels)' (aka 'struct ieee80211_channel *[]')

This was missed in the initial conversions because I failed to locate
the allocation likely due to the "sizeof(void *)" not matching the
"channels" array type.

https://git.kernel.org/stable/c/07c737d9ab02c07b562aefcca16aa95077368e24

https://git.kernel.org/stable/c/82bbe02b2500ef0a62053fe2eb84773fe31c5a0a

https://git.kernel.org/stable/c/e3192e999a0d05ea0ba2c59c09afaf0b8ee70b81

https://git.kernel.org/stable/c/fde33ab3c052a302ee8a0b739094b88ceae4dd67