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Message-Id: <20121004210637.615232809@linuxfoundation.org> Date: Thu, 4 Oct 2012 14:21:09 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, alan@...rguk.ukuu.org.uk, Jiri Slaby <jslaby@...e.cz>, Samo Pogacnik <samo_pogacnik@....net> Subject: [ 18/52] TTY: ttyprintk, dont touch behind tty->write_buf 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jiri Slaby <jslaby@...e.cz> commit ee8b593affdf893012e57f4c54a21984d1b0d92e 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@...e.cz> Cc: Samo Pogacnik <samo_pogacnik@....net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/char/ttyprintk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/char/ttyprintk.c +++ b/drivers/char/ttyprintk.c @@ -67,7 +67,7 @@ static int tpk_printk(const unsigned cha tmp[tpk_curr + 1] = '\0'; printk(KERN_INFO "%s%s", tpk_tag, tmp); tpk_curr = 0; - if (buf[i + 1] == '\n') + if ((i + 1) < count && buf[i + 1] == '\n') i++; break; case '\n': -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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