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Message-Id: <1344368886-24033-15-git-send-email-jslaby@suse.cz> Date: Tue, 7 Aug 2012 21:47:39 +0200 From: Jiri Slaby <jslaby@...e.cz> To: gregkh@...uxfoundation.org Cc: alan@...ux.intel.com, linux-kernel@...r.kernel.org, jirislaby@...il.com, stable@...r.kernel.org (everything maintained past v2.6.37), Samo Pogacnik <samo_pogacnik@....net> Subject: [PATCH 14/41] TTY: ttyprintk, don't touch behind tty->write_buf 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: stable@...r.kernel.org (everything maintained past v2.6.37) Cc: Samo Pogacnik <samo_pogacnik@....net> --- drivers/char/ttyprintk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/char/ttyprintk.c b/drivers/char/ttyprintk.c index 9b1e5e0..08755c5 100644 --- a/drivers/char/ttyprintk.c +++ b/drivers/char/ttyprintk.c @@ -67,7 +67,7 @@ static int tpk_printk(const unsigned char *buf, int count) 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': -- 1.7.10.4 -- 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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