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author | Willy Tarreau <w@1wt.eu> | 2017-05-16 17:18:55 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-25 13:44:30 (GMT) |
commit | 5d263d94a870a774a24acb2a2cc1e79ef39c2416 (patch) | |
tree | dd8eed6005f58494800f0b9deaf807fb91ddadde /drivers/char/lp.c | |
parent | 7a2b8471ab1243437215468b4da6c5ddfd4d80da (diff) | |
download | linux-5d263d94a870a774a24acb2a2cc1e79ef39c2416.tar.xz |
char: lp: fix possible integer overflow in lp_setup()
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>
Diffstat (limited to 'drivers/char/lp.c')
-rw-r--r-- | drivers/char/lp.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/char/lp.c b/drivers/char/lp.c index c4094c4..34ef474 100644 --- 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; } |