| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 005/103] char: lp: fix possible integer overflow in lp_setup() | Date | Tue, 23 May 2017 22:08:31 +0200 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Willy Tarreau <w@1wt.eu>
commit 3e21f4af170bebf47c187c1ff8bf155583c9f3b1 upstream.
The lp_setup() code doesn't apply any bounds checking when passing "lp=none", and only in this case, resulting in an overflow of the parport_nr[] array. All versions in Git history are affected.
Reported-By: Roee Hay <roee.hay@hcl.com> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/char/lp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/char/lp.c +++ b/drivers/char/lp.c @@ -859,7 +859,11 @@ static int __init lp_setup (char *str) } else if (!strcmp(str, "auto")) { parport_nr[0] = LP_PARPORT_AUTO; } else if (!strcmp(str, "none")) { - parport_nr[parport_ptr++] = LP_PARPORT_NONE; + if (parport_ptr < LP_NO) + parport_nr[parport_ptr++] = LP_PARPORT_NONE; + else + printk(KERN_INFO "lp: too many ports, %s ignored.\n", + str); } else if (!strcmp(str, "reset")) { reset = 1; }
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