[PATCH 001/190] Revert "net/rds: Avoid potential use after free in rds_send_remove_from_sock"

Greg Kroah-Hartman
2021-04-21T13:01:40Z

This reverts commit 0c85a7e87465f2d4cbc768e245f4f45b2f299b05.

Commits from @umn.edu addresses have been found to be submitted in "bad
faith" to try to test the kernel community's ability to review "known
malicious" changes. The result of these submissions can be found in a
paper published at the 42nd IEEE Symposium on Security and Privacy
entitled, "Open Source Insecurity: Stealthily Introducing
Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
of Minnesota) and Kangjie Lu (University of Minnesota).

Because of this, all submissions from this group must be reverted from
the kernel tree and will need to be re-reviewed again to determine if
they actually are a valid fix. Until that work is complete, remove this
change to ensure that no problems are being introduced into the
codebase.

Cc: Aditya Pakki <pakki001@umn.edu>
Cc: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/rds/message.c | 1 -
net/rds/send.c | 2 +-
2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/rds/message.c b/net/rds/message.c
index 4fc66ff0f1ec..799034e0f513 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -180,7 +180,6 @@ void rds_message_put(struct rds_message *rm)
rds_message_purge(rm);

kfree(rm);
- rm = NULL;
}
}
EXPORT_SYMBOL_GPL(rds_message_put);
diff --git a/net/rds/send.c b/net/rds/send.c
index fe5264b9d4b3..985d0b7713ac 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -665,7 +665,7 @@ static void rds_send_remove_from_sock(struct list_head *messages, int status)
unlock_and_drop:
spin_unlock_irqrestore(&rm->m_rs_lock, flags);
rds_message_put(rm);
- if (was_on_sock && rm)
+ if (was_on_sock)
rds_message_put(rm);
}

--
2.31.1