V4L/DVB (12341): zl10353 and qt1010: fix stack corruption bug

Fixes stack corruption bug present in dump_regs function of zl10353 and
qt1010 drivers: the buffer buf was one byte smaller than required -
there are 4 chars for address prefix, 16 * 3 chars for dump of 16 eeprom
bytes per line and 1 byte for zero ending the string required, i.e. 53
bytes, but only 52 were provided.

The one byte missing in stack based buffer buf can cause stack
corruption possibly leading to kernel oops, as discovered originally
with af9015 driver (af9015: fix stack corruption bug).

Signed-off-by: Jan Nikitenko <jan.nikitenko@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/common/tuners/qt1010.c b/drivers/media/common/tuners/qt1010.c
index 825aa1412e6f0ca039cb3729aded3d970fdc266f..9f5dba244cb86e7e361e992bbd45fedd41b1a1f9 100644 (file)
--- a/drivers/media/common/tuners/qt1010.c
+++ b/drivers/media/common/tuners/qt1010.c
@@ -64,24 +64,22 @@ static int qt1010_writereg(struct qt1010_priv *priv, u8 reg, u8 val)
 /* dump all registers */
 static void qt1010_dump_regs(struct qt1010_priv *priv)
 {
-       char buf[52], buf2[4];
        u8 reg, val;
 
        for (reg = 0; ; reg++) {
                if (reg % 16 == 0) {
                        if (reg)
-                               printk("%s\n", buf);
-                       sprintf(buf, "%02x: ", reg);
+                               printk(KERN_CONT "\n");
+                       printk(KERN_DEBUG "%02x:", reg);
                }
                if (qt1010_readreg(priv, reg, &val) == 0)
-                       sprintf(buf2, "%02x ", val);
+                       printk(KERN_CONT " %02x", val);
                else
-                       strcpy(buf2, "-- ");
-               strcat(buf, buf2);
+                       printk(KERN_CONT " --");
                if (reg == 0x2f)
                        break;
        }
-       printk("%s\n", buf);
+       printk(KERN_CONT "\n");
 }
 
 static int qt1010_set_params(struct dvb_frontend *fe,

diff --git a/drivers/media/dvb/frontends/zl10353.c b/drivers/media/dvb/frontends/zl10353.c
index 148b6f7f6cb253534b785ef2e6a95769e236fa45..66f5c1fb3074e60e13d481b558d2403803e9d5eb 100644 (file)
--- a/drivers/media/dvb/frontends/zl10353.c
+++ b/drivers/media/dvb/frontends/zl10353.c
@@ -98,7 +98,6 @@ static int zl10353_read_register(struct zl10353_state *state, u8 reg)
 static void zl10353_dump_regs(struct dvb_frontend *fe)
 {
        struct zl10353_state *state = fe->demodulator_priv;
-       char buf[52], buf2[4];
        int ret;
        u8 reg;
 
@@ -106,19 +105,18 @@ static void zl10353_dump_regs(struct dvb_frontend *fe)
        for (reg = 0; ; reg++) {
                if (reg % 16 == 0) {
                        if (reg)
-                               printk(KERN_DEBUG "%s\n", buf);
-                       sprintf(buf, "%02x: ", reg);
+                               printk(KERN_CONT "\n");
+                       printk(KERN_DEBUG "%02x:", reg);
                }
                ret = zl10353_read_register(state, reg);
                if (ret >= 0)
-                       sprintf(buf2, "%02x ", (u8)ret);
+                       printk(KERN_CONT " %02x", (u8)ret);
                else
-                       strcpy(buf2, "-- ");
-               strcat(buf, buf2);
+                       printk(KERN_CONT " --");
                if (reg == 0xff)
                        break;
        }
-       printk(KERN_DEBUG "%s\n", buf);
+       printk(KERN_CONT "\n");
 }
 
 static void zl10353_calc_nominal_rate(struct dvb_frontend *fe,