tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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mac80211: fix channel switch for chanctx-based drivers

The new_ctx pointer is set only for non-chanctx drivers. This yielded a
crash for chanctx-based drivers during channel switch finalization:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
IP: ieee80211_vif_use_reserved_switch+0x71c/0xb00 [mac80211]

Use an adequate chanctx pointer to fix this.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by

Michal Kazior and committed by
Linus Torvalds 47e4df94 433ab34d

+1 -1
+1 -1
net/mac80211/chan.c
··· 1444 1444 1445 1445 list_del(&sdata->reserved_chanctx_list); 1446 1446 list_move(&sdata->assigned_chanctx_list, 1447 - &new_ctx->assigned_vifs); 1447 + &ctx->assigned_vifs); 1448 1448 sdata->reserved_chanctx = NULL; 1449 1449 1450 1450 ieee80211_vif_chanctx_reservation_complete(sdata);