irda: Fix parameter extraction stack overflow
authorSamuel Ortiz <samuel@sortiz.org>
Sun, 10 Oct 2010 23:17:56 +0000 (01:17 +0200)
committerSamuel Ortiz <sameo@linux.intel.com>
Mon, 11 Oct 2010 00:12:17 +0000 (02:12 +0200)
Cc: stable@kernel.org
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
net/irda/parameters.c

index fc1a20565e2d7ab3cbef897ac4ed2d5793189a62..71cd38c1a67fcfe241215effff78efba06be966c 100644 (file)
@@ -298,6 +298,8 @@ static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi,
 
        p.pi = pi;     /* In case handler needs to know */
        p.pl = buf[1]; /* Extract length of value */
+       if (p.pl > 32)
+               p.pl = 32;
 
        IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d\n", __func__,
                   p.pi, p.pl);
@@ -318,7 +320,7 @@ static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi,
                   (__u8) str[0], (__u8) str[1]);
 
        /* Null terminate string */
-       str[p.pl+1] = '\0';
+       str[p.pl] = '\0';
 
        p.pv.c = str; /* Handler will need to take a copy */