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| author | He Zhe <zhe.he@windriver.com> | 2018-09-30 00:45:50 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-13 11:08:48 -0800 |
| commit | e945325eb75fa9f27727a3598dd41e2273ddf1a1 (patch) | |
| tree | 60f5b6f2266a12721aec4b0dda0005a3dcb014d6 /kernel | |
| parent | 93e2e86745480686f336d8c5ea699ca4125b49f8 (diff) | |
| download | linux-stable-e945325eb75fa9f27727a3598dd41e2273ddf1a1.tar.gz linux-stable-e945325eb75fa9f27727a3598dd41e2273ddf1a1.tar.bz2 linux-stable-e945325eb75fa9f27727a3598dd41e2273ddf1a1.zip | |
printk: Fix panic caused by passing log_buf_len to command line
commit 277fcdb2cfee38ccdbe07e705dbd4896ba0c9930 upstream.
log_buf_len_setup does not check input argument before passing it to
simple_strtoull. The argument would be a NULL pointer if "log_buf_len",
without its value, is set in command line and thus causes the following
panic.
PANIC: early exception 0xe3 IP 10:ffffffffaaeacd0d error 0 cr2 0x0
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.19.0-rc4-yocto-standard+ #1
[ 0.000000] RIP: 0010:_parse_integer_fixup_radix+0xd/0x70
...
[ 0.000000] Call Trace:
[ 0.000000] simple_strtoull+0x29/0x70
[ 0.000000] memparse+0x26/0x90
[ 0.000000] log_buf_len_setup+0x17/0x22
[ 0.000000] do_early_param+0x57/0x8e
[ 0.000000] parse_args+0x208/0x320
[ 0.000000] ? rdinit_setup+0x30/0x30
[ 0.000000] parse_early_options+0x29/0x2d
[ 0.000000] ? rdinit_setup+0x30/0x30
[ 0.000000] parse_early_param+0x36/0x4d
[ 0.000000] setup_arch+0x336/0x99e
[ 0.000000] start_kernel+0x6f/0x4ee
[ 0.000000] x86_64_start_reservations+0x24/0x26
[ 0.000000] x86_64_start_kernel+0x6f/0x72
[ 0.000000] secondary_startup_64+0xa4/0xb0
This patch adds a check to prevent the panic.
Link: http://lkml.kernel.org/r/1538239553-81805-1-git-send-email-zhe.he@windriver.com
Cc: stable@vger.kernel.org
Cc: rostedt@goodmis.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: He Zhe <zhe.he@windriver.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/printk/printk.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 9bf5404397e0..06045abd1887 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -1048,7 +1048,12 @@ static void __init log_buf_len_update(unsigned size) /* save requested log_buf_len since it's too early to process it */ static int __init log_buf_len_setup(char *str) { - unsigned size = memparse(str, &str); + unsigned int size; + + if (!str) + return -EINVAL; + + size = memparse(str, &str); log_buf_len_update(size); |