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author | Zekun Shen <bruceshenzk@gmail.com> | 2020-06-15 11:50:29 -0400 |
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committer | Sasha Levin <sashal@kernel.org> | 2020-06-30 23:17:14 -0400 |
commit | 8114ae273a366652eaf42eff4716e4f5a18c7988 (patch) | |
tree | 0fe6a366c2ea1ed8c761fdac0c6672de4000f9cb /arch/s390 | |
parent | ed1e2fcb187620947de899948439907f0df67faf (diff) | |
download | linux-stable-8114ae273a366652eaf42eff4716e4f5a18c7988.tar.gz linux-stable-8114ae273a366652eaf42eff4716e4f5a18c7988.tar.bz2 linux-stable-8114ae273a366652eaf42eff4716e4f5a18c7988.zip |
net: alx: fix race condition in alx_remove
[ Upstream commit e89df5c4322c1bf495f62d74745895b5fd2a4393 ]
There is a race condition exist during termination. The path is
alx_stop and then alx_remove. An alx_schedule_link_check could be called
before alx_stop by interrupt handler and invoke alx_link_check later.
Alx_stop frees the napis, and alx_remove cancels any pending works.
If any of the work is scheduled before termination and invoked before
alx_remove, a null-ptr-deref occurs because both expect alx->napis[i].
This patch fix the race condition by moving cancel_work_sync functions
before alx_free_napis inside alx_stop. Because interrupt handler can call
alx_schedule_link_check again, alx_free_irq is moved before
cancel_work_sync calls too.
Signed-off-by: Zekun Shen <bruceshenzk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/s390')
0 files changed, 0 insertions, 0 deletions