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authorMagnus Karlsson <magnus.karlsson@intel.com>2023-08-09 16:28:43 +0200
committerMartin KaFai Lau <martin.lau@kernel.org>2023-08-09 20:08:04 -0700
commit85c2c79a07302fe68a1ad5cc449458cc559e314d (patch)
tree6e0050a230e813d4d021b191fd78c1f2b721c50a /net
parent999f6631866e9ea81add935b9c6ebaab0579d259 (diff)
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xsk: fix refcount underflow in error path
Fix a refcount underflow problem reported by syzbot that can happen when a system is running out of memory. If xp_alloc_tx_descs() fails, and it can only fail due to not having enough memory, then the error path is triggered. In this error path, the refcount of the pool is decremented as it has incremented before. However, the reference to the pool in the socket was not nulled. This means that when the socket is closed later, the socket teardown logic will think that there is a pool attached to the socket and try to decrease the refcount again, leading to a refcount underflow. I chose this fix as it involved adding just a single line. Another option would have been to move xp_get_pool() and the assignment of xs->pool to after the if-statement and using xs_umem->pool instead of xs->pool in the whole if-statement resulting in somewhat simpler code, but this would have led to much more churn in the code base perhaps making it harder to backport. Fixes: ba3beec2ec1d ("xsk: Fix possible crash when multiple sockets are created") Reported-by: syzbot+8ada0057e69293a05fd4@syzkaller.appspotmail.com Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com> Link: https://lore.kernel.org/r/20230809142843.13944-1-magnus.karlsson@gmail.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Diffstat (limited to 'net')
-rw-r--r--net/xdp/xsk.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index b89adb52a977..10ea85c03147 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -994,6 +994,7 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
err = xp_alloc_tx_descs(xs->pool, xs);
if (err) {
xp_put_pool(xs->pool);
+ xs->pool = NULL;
sockfd_put(sock);
goto out_unlock;
}