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| author |   Shreyas Joshi <shreyas.joshi@biamp.com> | 2020-05-22 16:53:06 +1000 |
|---|---|---|
| committer |   Petr Mladek <pmladek@suse.com> | 2020-05-22 10:34:34 +0200 |
| commit | 48021f98130880dd74286459a1ef48b5e9bc374f (patch) | |
| tree | e6a21abe07796b9f31d8638457f5e161750a0c43 /kernel/printk | |
| parent | kernel/printk: add kmsg SEEK_CUR handling (diff) | |
| download | wireguard-linux-48021f98130880dd74286459a1ef48b5e9bc374f.tar.xz wireguard-linux-48021f98130880dd74286459a1ef48b5e9bc374f.zip | |
printk: handle blank console arguments passed in.
If uboot passes a blank string to console_setup then it results in
a trashed memory. Ultimately, the kernel crashes during freeing up
the memory.
This fix checks if there is a blank parameter being
passed to console_setup from uboot. In case it detects that
the console parameter is blank then it doesn't setup the serial
device and it gracefully exits.
Link: https://lore.kernel.org/r/20200522065306.83-1-shreyas.joshi@biamp.com
Signed-off-by: Shreyas Joshi <shreyas.joshi@biamp.com>
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
[pmladek@suse.com: Better format the commit message and code, remove unnecessary brackets.]
Signed-off-by: Petr Mladek <pmladek@suse.com>
Diffstat (limited to 'kernel/printk')
| -rw-r--r-- | kernel/printk/printk.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 35cc5f548860..a3990505abdf 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -2200,6 +2200,9 @@ static int __init console_setup(char *str) char *s, *options, *brl_options = NULL; int idx; + if (str[0] == 0) + return 1; + if (_braille_console_setup(&str, &brl_options)) return 1; |