diff mbox series

[4.19,118/264] nl80211: fix non-split wiphy information

Message ID 20201027135436.233847377@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg KH Oct. 27, 2020, 1:52 p.m. UTC 
From: Johannes Berg <johannes.berg@intel.com>

[ Upstream commit ab10c22bc3b2024f0c9eafa463899a071eac8d97 ]

When dumping wiphy information, we try to split the data into
many submessages, but for old userspace we still support the
old mode where this doesn't happen.

However, in this case we were not resetting our state correctly
and dumping multiple messages for each wiphy, which would have
broken such older userspace.

This was broken pretty much immediately afterwards because it
only worked in the original commit where non-split dumps didn't
have any more data than split dumps...

Fixes: fe1abafd942f ("nl80211: re-add channel width and extended capa advertising")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20200928130717.3e6d9c6bada2.Ie0f151a8d0d00a8e1e18f6a8c9244dd02496af67@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/wireless/nl80211.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 4e41792099822..fbc8875502c3e 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -1950,7 +1950,10 @@  static int nl80211_send_wiphy(struct cfg80211_registered_device *rdev,
 		 * case we'll continue with more data in the next round,
 		 * but break unconditionally so unsplit data stops here.
 		 */
-		state->split_start++;
+		if (state->split)
+			state->split_start++;
+		else
+			state->split_start = 0;
 		break;
 	case 9:
 		if (rdev->wiphy.extended_capabilities &&