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TTY: ttyprintk, don't touch behind tty->write_buf

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commit ee8b593aff upstream.

If a user provides a buffer larger than a tty->write_buf chunk and
passes '\r' at the end of the buffer, we touch an out-of-bound memory.

Add a check there to prevent this.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Samo Pogacnik <samo_pogacnik@t-2.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2012-08-07 21:47:39 +02:00 committed by Greg Kroah-Hartman
parent e2a43abf3d
commit 804f6a4a47
1 changed files with 1 additions and 1 deletions
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2
drivers/char/ttyprintk.c
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@ -67,7 +67,7 @@ static int tpk_printk(const unsigned char *buf, int count)
tmp[tpk_curr + 1] = '\0'; tmp[tpk_curr + 1] = '\0';
printk(KERN_INFO "%s%s", tpk_tag, tmp); printk(KERN_INFO "%s%s", tpk_tag, tmp);
tpk_curr = 0; tpk_curr = 0;
if (buf[i + 1] == '\n') if ((i + 1) < count && buf[i + 1] == '\n')
i++; i++;
break; break;
case '\n': case '\n':