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27 March 2024, 02:37:15 UTC
Revision c1df932c0574c13ab3ce72e969c9647ff3aaad68 authored by Johannes Berg on 27 November 2015, 20:59:41 UTC, committed by Johannes Berg on 02 December 2015, 21:27:53 UTC 
mac80211: fix off-channel mgmt-tx uninitialized variable usage
 
In the last change here, I neglected to update the cookie in one code
path: when a mgmt-tx has no real cookie sent to userspace as it doesn't
wait for a response, but is off-channel. The original code used the SKB
pointer as the cookie and always assigned the cookie to the TX SKB in
ieee80211_start_roc_work(), but my change turned this around and made
the code rely on a valid cookie being passed in.

Unfortunately, the off-channel no-wait TX path wasn't assigning one at
all, resulting in an uninitialized stack value being used. This wasn't
handed back to userspace as a cookie (since in the no-wait case there
isn't a cookie), but it was tested for non-zero to distinguish between
mgmt-tx and off-channel.

Fix this by assigning a dummy non-zero cookie unconditionally, and get
rid of a misleading comment and some dead code while at it. I'll clean
up the ACK SKB handling separately later.

Fixes: 3b79af973cf4 ("mac80211: stop using pointers as userspace cookies")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1 parent 4e39cca
History
Tip revision: c1df932c0574c13ab3ce72e969c9647ff3aaad68 authored by Johannes Berg on 27 November 2015, 20:59:41 UTC
mac80211: fix off-channel mgmt-tx uninitialized variable usage
Tip revision: c1df932
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.get_maintainer.ignore -rw-r--r-- 31 bytes
.gitignore -rw-r--r-- 1.2 KB
.mailmap -rw-r--r-- 5.4 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 94.9 KB
Kbuild -rw-r--r-- 2.6 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 327.7 KB
Makefile -rw-r--r-- 53.5 KB
README -rw-r--r-- 18.2 KB
REPORTING-BUGS -rw-r--r-- 7.3 KB

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