From: Greg Kroah-Hartman Date: Mon, 22 Aug 2022 09:22:25 +0000 (+0200) Subject: 4.9-stable patches X-Git-Tag: v4.9.326~59 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=6a9d44443470605aff71225e689009e287048d57;p=thirdparty%2Fkernel%2Fstable-queue.git 4.9-stable patches added patches: atm-idt77252-fix-use-after-free-bugs-caused-by-tst_timer.patch xen-xenbus-fix-return-type-in-xenbus_file_read.patch --- diff --git a/queue-4.9/atm-idt77252-fix-use-after-free-bugs-caused-by-tst_timer.patch b/queue-4.9/atm-idt77252-fix-use-after-free-bugs-caused-by-tst_timer.patch new file mode 100644 index 00000000000..a4d9bb23a42 --- /dev/null +++ b/queue-4.9/atm-idt77252-fix-use-after-free-bugs-caused-by-tst_timer.patch @@ -0,0 +1,51 @@ +From 3f4093e2bf4673f218c0bf17d8362337c400e77b Mon Sep 17 00:00:00 2001 +From: Duoming Zhou +Date: Fri, 5 Aug 2022 15:00:08 +0800 +Subject: atm: idt77252: fix use-after-free bugs caused by tst_timer + +From: Duoming Zhou + +commit 3f4093e2bf4673f218c0bf17d8362337c400e77b upstream. + +There are use-after-free bugs caused by tst_timer. The root cause +is that there are no functions to stop tst_timer in idt77252_exit(). +One of the possible race conditions is shown below: + + (thread 1) | (thread 2) + | idt77252_init_one + | init_card + | fill_tst + | mod_timer(&card->tst_timer, ...) +idt77252_exit | (wait a time) + | tst_timer + | + | ... + kfree(card) // FREE | + | card->soft_tst[e] // USE + +The idt77252_dev is deallocated in idt77252_exit() and used in +timer handler. + +This patch adds del_timer_sync() in idt77252_exit() in order that +the timer handler could be stopped before the idt77252_dev is +deallocated. + +Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") +Signed-off-by: Duoming Zhou +Link: https://lore.kernel.org/r/20220805070008.18007-1-duoming@zju.edu.cn +Signed-off-by: Jakub Kicinski +Signed-off-by: Greg Kroah-Hartman +--- + drivers/atm/idt77252.c | 1 + + 1 file changed, 1 insertion(+) + +--- a/drivers/atm/idt77252.c ++++ b/drivers/atm/idt77252.c +@@ -3777,6 +3777,7 @@ static void __exit idt77252_exit(void) + card = idt77252_chain; + dev = card->atmdev; + idt77252_chain = card->next; ++ del_timer_sync(&card->tst_timer); + + if (dev->phy->stop) + dev->phy->stop(dev); diff --git a/queue-4.9/series b/queue-4.9/series index 964c7895b91..489c36c6748 100644 --- a/queue-4.9/series +++ b/queue-4.9/series @@ -73,3 +73,5 @@ sunrpc-reinitialise-the-backchannel-request-buffers-before-reuse.patch pinctrl-nomadik-fix-refcount-leak-in-nmk_pinctrl_dt_subnode_to_map.patch pinctrl-qcom-msm8916-allow-camss-gp-clocks-to-be-muxed.patch vsock-fix-memory-leak-in-vsock_connect.patch +xen-xenbus-fix-return-type-in-xenbus_file_read.patch +atm-idt77252-fix-use-after-free-bugs-caused-by-tst_timer.patch diff --git a/queue-4.9/xen-xenbus-fix-return-type-in-xenbus_file_read.patch b/queue-4.9/xen-xenbus-fix-return-type-in-xenbus_file_read.patch new file mode 100644 index 00000000000..6e9da99d364 --- /dev/null +++ b/queue-4.9/xen-xenbus-fix-return-type-in-xenbus_file_read.patch @@ -0,0 +1,48 @@ +From 32ad11127b95236dfc52375f3707853194a7f4b4 Mon Sep 17 00:00:00 2001 +From: Dan Carpenter +Date: Thu, 4 Aug 2022 10:11:33 +0300 +Subject: xen/xenbus: fix return type in xenbus_file_read() + +From: Dan Carpenter + +commit 32ad11127b95236dfc52375f3707853194a7f4b4 upstream. + +This code tries to store -EFAULT in an unsigned int. The +xenbus_file_read() function returns type ssize_t so the negative value +is returned as a positive value to the user. + +This change forces another change to the min() macro. Originally, the +min() macro used "unsigned" type which checkpatch complains about. Also +unsigned type would break if "len" were not capped at MAX_RW_COUNT. Use +size_t for the min(). (No effect on runtime for the min_t() change). + +Fixes: 2fb3683e7b16 ("xen: Add xenbus device driver") +Signed-off-by: Dan Carpenter +Reviewed-by: Oleksandr Tyshchenko +Link: https://lore.kernel.org/r/YutxJUaUYRG/VLVc@kili +Signed-off-by: Juergen Gross +Signed-off-by: Greg Kroah-Hartman +--- + drivers/xen/xenbus/xenbus_dev_frontend.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +--- a/drivers/xen/xenbus/xenbus_dev_frontend.c ++++ b/drivers/xen/xenbus/xenbus_dev_frontend.c +@@ -122,7 +122,7 @@ static ssize_t xenbus_file_read(struct f + { + struct xenbus_file_priv *u = filp->private_data; + struct read_buffer *rb; +- unsigned i; ++ ssize_t i; + int ret; + + mutex_lock(&u->reply_mutex); +@@ -142,7 +142,7 @@ again: + rb = list_entry(u->read_buffers.next, struct read_buffer, list); + i = 0; + while (i < len) { +- unsigned sz = min((unsigned)len - i, rb->len - rb->cons); ++ size_t sz = min_t(size_t, len - i, rb->len - rb->cons); + + ret = copy_to_user(ubuf + i, &rb->msg[rb->cons], sz); +