From: Takashi Sakamoto <o-takashi@sakamocchi.jp> To: tiwai@suse.de Cc: linux1394-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org, Chengfeng Ye <cyeaa@connect.ust.hk>, stable@vger.kernel.org Subject: [PATCH 1/3] firewire: fix potential uaf in outbound_phy_packet_callback() Date: Sat, 9 Apr 2022 13:12:41 +0900 [thread overview] Message-ID: <20220409041243.603210-2-o-takashi@sakamocchi.jp> (raw) In-Reply-To: <20220409041243.603210-1-o-takashi@sakamocchi.jp> From: Chengfeng Ye <cyeaa@connect.ust.hk> &e->event and e point to the same address, and &e->event could be freed in queue_event. So there is a potential uaf issue if we dereference e after calling queue_event(). Fix this by adding a temporary variable to maintain e->client in advance, this can avoid the potential uaf issue. Cc: <stable@vger.kernel.org> Signed-off-by: Chengfeng Ye <cyeaa@connect.ust.hk> Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> --- drivers/firewire/core-cdev.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c index 9f89c17730b1..708e417200f4 100644 --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -1500,6 +1500,7 @@ static void outbound_phy_packet_callback(struct fw_packet *packet, { struct outbound_phy_packet_event *e = container_of(packet, struct outbound_phy_packet_event, p); + struct client *e_client; switch (status) { /* expected: */ @@ -1516,9 +1517,10 @@ static void outbound_phy_packet_callback(struct fw_packet *packet, } e->phy_packet.data[0] = packet->timestamp; + e_client = e->client; queue_event(e->client, &e->event, &e->phy_packet, sizeof(e->phy_packet) + e->phy_packet.length, NULL, 0); - client_put(e->client); + client_put(e_client); } static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg) -- 2.34.1
WARNING: multiple messages have this Message-ID (diff)
From: Takashi Sakamoto <o-takashi@sakamocchi.jp> To: tiwai@suse.de Cc: alsa-devel@alsa-project.org, linux1394-devel@lists.sourceforge.net, Chengfeng Ye <cyeaa@connect.ust.hk>, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH 1/3] firewire: fix potential uaf in outbound_phy_packet_callback() Date: Sat, 9 Apr 2022 13:12:41 +0900 [thread overview] Message-ID: <20220409041243.603210-2-o-takashi@sakamocchi.jp> (raw) In-Reply-To: <20220409041243.603210-1-o-takashi@sakamocchi.jp> From: Chengfeng Ye <cyeaa@connect.ust.hk> &e->event and e point to the same address, and &e->event could be freed in queue_event. So there is a potential uaf issue if we dereference e after calling queue_event(). Fix this by adding a temporary variable to maintain e->client in advance, this can avoid the potential uaf issue. Cc: <stable@vger.kernel.org> Signed-off-by: Chengfeng Ye <cyeaa@connect.ust.hk> Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> --- drivers/firewire/core-cdev.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c index 9f89c17730b1..708e417200f4 100644 --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -1500,6 +1500,7 @@ static void outbound_phy_packet_callback(struct fw_packet *packet, { struct outbound_phy_packet_event *e = container_of(packet, struct outbound_phy_packet_event, p); + struct client *e_client; switch (status) { /* expected: */ @@ -1516,9 +1517,10 @@ static void outbound_phy_packet_callback(struct fw_packet *packet, } e->phy_packet.data[0] = packet->timestamp; + e_client = e->client; queue_event(e->client, &e->event, &e->phy_packet, sizeof(e->phy_packet) + e->phy_packet.length, NULL, 0); - client_put(e->client); + client_put(e_client); } static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg) -- 2.34.1
next prev parent reply other threads:[~2022-04-09 4:13 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-04-09 4:12 [PATCH 0/3] firewire: fixes for kernel v4.9 or later Takashi Sakamoto 2022-04-09 4:12 ` Takashi Sakamoto 2022-04-09 4:12 ` Takashi Sakamoto [this message] 2022-04-09 4:12 ` [PATCH 1/3] firewire: fix potential uaf in outbound_phy_packet_callback() Takashi Sakamoto 2022-04-09 4:12 ` [PATCH 2/3] firewire: remove check of list iterator against head past the loop body Takashi Sakamoto 2022-04-09 4:12 ` Takashi Sakamoto 2022-04-09 4:12 ` [PATCH 3/3] firewire: core: extend card->lock in fw_core_handle_bus_reset Takashi Sakamoto 2022-04-09 4:12 ` Takashi Sakamoto 2022-04-25 6:05 ` [PATCH 0/3] firewire: fixes for kernel v4.9 or later Takashi Iwai 2022-04-25 6:05 ` Takashi Iwai
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20220409041243.603210-2-o-takashi@sakamocchi.jp \ --to=o-takashi@sakamocchi.jp \ --cc=alsa-devel@alsa-project.org \ --cc=cyeaa@connect.ust.hk \ --cc=linux-kernel@vger.kernel.org \ --cc=linux1394-devel@lists.sourceforge.net \ --cc=stable@vger.kernel.org \ --cc=tiwai@suse.de \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.