Commit d8593121 authored by Shreyas Joshi's avatar Shreyas Joshi Committed by Greg Kroah-Hartman

printk: handle blank console arguments passed in.

[ Upstream commit 48021f98 ]

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.comSigned-off-by: default avatarShreyas Joshi <shreyas.joshi@biamp.com>
Acked-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
[pmladek@suse.com: Better format the commit message and code, remove unnecessary brackets.]
Signed-off-by: default avatarPetr Mladek <pmladek@suse.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 881e984e
......@@ -2035,6 +2035,9 @@ 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;
......
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