diff options
| author | Michael Chan <mchan@broadcom.com> | 2006-11-07 14:57:51 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-11-07 15:10:16 -0800 |
| commit | af2c6a4aaa2253f1e29df8fb59a3d92174d30a33 (patch) | |
| tree | 5eb583eb426b70c342d7a5a0577b44564de70538 | |
| parent | 25f484a62e41be8020b9a31bf50a792baa58d2d4 (diff) | |
| download | linux-af2c6a4aaa2253f1e29df8fb59a3d92174d30a33.tar.bz2 | |
[TG3]: Fix array overrun in tg3_read_partno().
Use proper upper limits for the loops and check for all error
conditions.
The problem was noticed by Adrian Bunk.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/tg3.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c index 8f059b7968bd..06e4f77b0988 100644 --- a/drivers/net/tg3.c +++ b/drivers/net/tg3.c @@ -10212,7 +10212,7 @@ skip_phy_reset: static void __devinit tg3_read_partno(struct tg3 *tp) { unsigned char vpd_data[256]; - int i; + unsigned int i; u32 magic; if (tg3_nvram_read_swab(tp, 0x0, &magic)) @@ -10258,9 +10258,9 @@ static void __devinit tg3_read_partno(struct tg3 *tp) } /* Now parse and find the part number. */ - for (i = 0; i < 256; ) { + for (i = 0; i < 254; ) { unsigned char val = vpd_data[i]; - int block_end; + unsigned int block_end; if (val == 0x82 || val == 0x91) { i = (i + 3 + @@ -10276,21 +10276,26 @@ static void __devinit tg3_read_partno(struct tg3 *tp) (vpd_data[i + 1] + (vpd_data[i + 2] << 8))); i += 3; - while (i < block_end) { + + if (block_end > 256) + goto out_not_found; + + while (i < (block_end - 2)) { if (vpd_data[i + 0] == 'P' && vpd_data[i + 1] == 'N') { int partno_len = vpd_data[i + 2]; - if (partno_len > 24) + i += 3; + if (partno_len > 24 || (partno_len + i) > 256) goto out_not_found; memcpy(tp->board_part_number, - &vpd_data[i + 3], - partno_len); + &vpd_data[i], partno_len); /* Success. */ return; } + i += 3 + vpd_data[i + 2]; } /* Part number not found. */ |