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3b5a39979d
Driver/net/can/slcan.c is derived from slip.c. Memory leak was detected
by Syzkaller in slcan. Same issue exists in slip.c and this patch is
addressing the leak in slip.c.
Here is the slcan memory leak trace reported by Syzkaller:
BUG: memory leak unreferenced object 0xffff888067f65500 (size 4096):
comm "syz-executor043", pid 454, jiffies 4294759719 (age 11.930s)
hex dump (first 32 bytes):
73 6c 63 61 6e 30 00 00 00 00 00 00 00 00 00 00 slcan0..........
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000a06eec0d>] __kmalloc+0x18b/0x2c0
[<0000000083306e66>] kvmalloc_node+0x3a/0xc0
[<000000006ac27f87>] alloc_netdev_mqs+0x17a/0x1080
[<0000000061a996c9>] slcan_open+0x3ae/0x9a0
[<000000001226f0f9>] tty_ldisc_open.isra.1+0x76/0xc0
[<0000000019289631>] tty_set_ldisc+0x28c/0x5f0
[<000000004de5a617>] tty_ioctl+0x48d/0x1590
[<00000000daef496f>] do_vfs_ioctl+0x1c7/0x1510
[<0000000059068dbc>] ksys_ioctl+0x99/0xb0
[<000000009a6eb334>] __x64_sys_ioctl+0x78/0xb0
[<0000000053d0332e>] do_syscall_64+0x16f/0x580
[<0000000021b83b99>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[<000000008ea75434>] 0xfffffffffffffff
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Oliver Hartkopp <socketcan@hartkopp.net>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Jouni Hogander <jouni.hogander@unikie.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.