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authorLinus Torvalds <torvalds@linux-foundation.org>2021-04-24 09:32:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-04-24 09:32:35 -0700
commit799bac5512188522213e2d7eb78ca7094dfdf30c (patch)
treec9a95a46f3edbb8a415f4301b3ff65c823b5d41a
parent8db5efb83fa99e81c3f8dee92a6589b251f117f3 (diff)
Revert "net/rds: Avoid potential use after free in rds_send_remove_from_sock"
This reverts commit 0c85a7e87465f2d4cbc768e245f4f45b2f299b05. The games with 'rm' are on (two separate instances) of a local variable, and make no difference. Quoting Aditya Pakki: "I was the author of the patch and it was the cause of the giant UMN revert. The patch is garbage and I was unaware of the steps involved in retracting it. I *believed* the maintainers would pull it, given it was already under Greg's list. The patch does not introduce any bugs but is pointless and is stupid. I accept my incompetence and for not requesting a revert earlier." Link: https://lwn.net/Articles/854319/ Requested-by: Aditya Pakki <pakki001@umn.edu> Cc: Santosh Shilimkar <santosh.shilimkar@oracle.com> Cc: David S. Miller <davem@davemloft.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--net/rds/message.c1
-rw-r--r--net/rds/send.c2
2 files changed, 1 insertions, 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);
}