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

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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>
This commit is contained in:
Jan Nikitenko 2009-06-18 08:11:57 -03:00 committed by Mauro Carvalho Chehab
parent 296544e15a
commit 458f9aa391
2 changed files with 10 additions and 14 deletions
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12
drivers/media/common/tuners/qt1010.c
View file

@ -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,

12
drivers/media/dvb/frontends/zl10353.c
View file

@ -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,