6.13-stable patches

added patches:
	mptcp-fix-data-stream-corruption-in-the-address-announcement.patch

diff --git a/queue-6.13/mptcp-fix-data-stream-corruption-in-the-address-announcement.patch b/queue-6.13/mptcp-fix-data-stream-corruption-in-the-address-announcement.patch
new file mode 100644 (file)
index 0000000..89ef12a
--- /dev/null
+++ b/queue-6.13/mptcp-fix-data-stream-corruption-in-the-address-announcement.patch
@@ -0,0 +1,78 @@
+From 2c1f97a52cb827a5f2768e67a9dddffae1ed47ab Mon Sep 17 00:00:00 2001
+From: Arthur Mongodin <amongodin@randorisec.fr>
+Date: Fri, 14 Mar 2025 21:11:31 +0100
+Subject: mptcp: Fix data stream corruption in the address announcement
+
+From: Arthur Mongodin <amongodin@randorisec.fr>
+
+commit 2c1f97a52cb827a5f2768e67a9dddffae1ed47ab upstream.
+
+Because of the size restriction in the TCP options space, the MPTCP
+ADD_ADDR option is exclusive and cannot be sent with other MPTCP ones.
+For this reason, in the linked mptcp_out_options structure, group of
+fields linked to different options are part of the same union.
+
+There is a case where the mptcp_pm_add_addr_signal() function can modify
+opts->addr, but not ended up sending an ADD_ADDR. Later on, back in
+mptcp_established_options, other options will be sent, but with
+unexpected data written in other fields due to the union, e.g. in
+opts->ext_copy. This could lead to a data stream corruption in the next
+packet.
+
+Using an intermediate variable, prevents from corrupting previously
+established DSS option. The assignment of the ADD_ADDR option
+parameters is now done once we are sure this ADD_ADDR option can be set
+in the packet, e.g. after having dropped other suboptions.
+
+Fixes: 1bff1e43a30e ("mptcp: optimize out option generation")
+Cc: stable@vger.kernel.org
+Suggested-by: Paolo Abeni <pabeni@redhat.com>
+Signed-off-by: Arthur Mongodin <amongodin@randorisec.fr>
+Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
+[ Matt: the commit message has been updated: long lines splits and some
+  clarifications. ]
+Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
+Reviewed-by: Simon Horman <horms@kernel.org>
+Link: https://patch.msgid.link/20250314-net-mptcp-fix-data-stream-corr-sockopt-v1-1-122dbb249db3@kernel.org
+Signed-off-by: Paolo Abeni <pabeni@redhat.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/mptcp/options.c |    6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+--- a/net/mptcp/options.c
++++ b/net/mptcp/options.c
+@@ -651,6 +651,7 @@ static bool mptcp_established_options_ad
+       struct mptcp_sock *msk = mptcp_sk(subflow->conn);
+       bool drop_other_suboptions = false;
+       unsigned int opt_size = *size;
++      struct mptcp_addr_info addr;
+       bool echo;
+       int len;
+ 
+@@ -659,7 +660,7 @@ static bool mptcp_established_options_ad
+        */
+       if (!mptcp_pm_should_add_signal(msk) ||
+           (opts->suboptions & (OPTION_MPTCP_MPJ_ACK | OPTION_MPTCP_MPC_ACK)) ||
+-          !mptcp_pm_add_addr_signal(msk, skb, opt_size, remaining, &opts->addr,
++          !mptcp_pm_add_addr_signal(msk, skb, opt_size, remaining, &addr,
+                   &echo, &drop_other_suboptions))
+               return false;
+ 
+@@ -672,7 +673,7 @@ static bool mptcp_established_options_ad
+       else if (opts->suboptions & OPTION_MPTCP_DSS)
+               return false;
+ 
+-      len = mptcp_add_addr_len(opts->addr.family, echo, !!opts->addr.port);
++      len = mptcp_add_addr_len(addr.family, echo, !!addr.port);
+       if (remaining < len)
+               return false;
+ 
+@@ -689,6 +690,7 @@ static bool mptcp_established_options_ad
+               opts->ahmac = 0;
+               *size -= opt_size;
+       }
++      opts->addr = addr;
+       opts->suboptions |= OPTION_MPTCP_ADD_ADDR;
+       if (!echo) {
+               MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ADDADDRTX);

diff --git a/queue-6.13/series b/queue-6.13/series
index d2e434dfe63995405cf221029eb28a781254323e..920b93b01dfd54a2624476d9faf86e30559b281b 100644 (file)
--- a/queue-6.13/series
+++ b/queue-6.13/series
@@ -116,3 +116,4 @@ kvm-arm64-refactor-exit-handlers.patch
 kvm-arm64-mark-some-header-functions-as-inline.patch
 kvm-arm64-eagerly-switch-zcr_el-1-2.patch
 revert-sched-core-reduce-cost-of-sched_move_task-when-config-autogroup.patch
+mptcp-fix-data-stream-corruption-in-the-address-announcement.patch