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| author | Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> | 2020-04-10 14:32:57 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2020-04-14 12:31:46 +0200 |
| commit | 7ea862048317aa76d0f22334202779a25530980c (patch) | |
| tree | 777d9da213eb7bb24cf86464afca0908fba178fd /include | |
| parent | nl80211: fix NL80211_ATTR_FTM_RESPONDER policy (diff) | |
| download | linux-7ea862048317aa76d0f22334202779a25530980c.tar.xz linux-7ea862048317aa76d0f22334202779a25530980c.zip | |
mac80211_hwsim: Use kstrndup() in place of kasprintf()
syzbot reports a warning:
precision 33020 too large
WARNING: CPU: 0 PID: 9618 at lib/vsprintf.c:2471 set_precision+0x150/0x180 lib/vsprintf.c:2471
vsnprintf+0xa7b/0x19a0 lib/vsprintf.c:2547
kvasprintf+0xb2/0x170 lib/kasprintf.c:22
kasprintf+0xbb/0xf0 lib/kasprintf.c:59
hwsim_del_radio_nl+0x63a/0x7e0 drivers/net/wireless/mac80211_hwsim.c:3625
genl_family_rcv_msg_doit net/netlink/genetlink.c:672 [inline]
...
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Thus it seems that kasprintf() with "%.*s" format can not be used for
duplicating a string with arbitrary length. Replace it with kstrndup().
Note that later this string is limited to NL80211_WIPHY_NAME_MAXLEN == 64,
but the code is simpler this way.
Reported-by: syzbot+6693adf1698864d21734@syzkaller.appspotmail.com
Reported-by: syzbot+a4aee3f42d7584d76761@syzkaller.appspotmail.com
Cc: stable@kernel.org
Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
Link: https://lore.kernel.org/r/20200410123257.14559-1-tuomas.tynkkynen@iki.fi
[johannes: add note about length limit]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions