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author | Roel Kluin <roel.kluin@gmail.com> | 2009-08-02 09:44:12 +0200 |
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committer | John W. Linville <linville@tuxdriver.com> | 2009-08-28 14:40:35 -0400 |
commit | 1e3d31c589a6bcb05cd7fccccf9657c27b0e3dd1 (patch) | |
tree | e8a3cee9d0e1680a06db7b557bae254d465c912d | |
parent | 1c4e9ab3f1cc458306b3b910000371ba4f71c4d2 (diff) | |
download | linux-3.10-1e3d31c589a6bcb05cd7fccccf9657c27b0e3dd1.tar.gz linux-3.10-1e3d31c589a6bcb05cd7fccccf9657c27b0e3dd1.tar.bz2 linux-3.10-1e3d31c589a6bcb05cd7fccccf9657c27b0e3dd1.zip |
libertas: Read buffer overflow
Check whether index is within bounds before testing the element.
(also includes "Libertas: Association request to the driver failed"
The size of the tmp buffer was too small, causing a regression
rates->rates has an arraysize of 1, so a memcpy with
MAX_RATES (14) was already causing reads out of bounds.
In get_common_rates() the memset/memcpy can be moved upwards. -- JWL)
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Tested-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r-- | drivers/net/wireless/libertas/assoc.c | 31 |
1 files changed, 15 insertions, 16 deletions
diff --git a/drivers/net/wireless/libertas/assoc.c b/drivers/net/wireless/libertas/assoc.c index 81f86ef2699..a9440a96b2e 100644 --- a/drivers/net/wireless/libertas/assoc.c +++ b/drivers/net/wireless/libertas/assoc.c @@ -44,12 +44,11 @@ static int get_common_rates(struct lbs_private *priv, { u8 *card_rates = lbs_bg_rates; size_t num_card_rates = sizeof(lbs_bg_rates); - int ret = 0, i, j; + int i, j; u8 *tmp; size_t tmp_size = 0; - tmp = kzalloc((ARRAY_SIZE(lbs_bg_rates) - 1) * (*rates_size - 1), - GFP_KERNEL); + tmp = kzalloc(MAX_RATES * ARRAY_SIZE(lbs_bg_rates), GFP_KERNEL); if (!tmp) return -1; @@ -66,24 +65,24 @@ static int get_common_rates(struct lbs_private *priv, lbs_deb_hex(LBS_DEB_JOIN, "common rates", tmp, tmp_size); lbs_deb_join("TX data rate 0x%02x\n", priv->cur_rate); + memset(rates, 0, *rates_size); + *rates_size = min_t(u16, tmp_size, *rates_size); + memcpy(rates, tmp, *rates_size); + if (!priv->enablehwauto) { for (i = 0; i < tmp_size; i++) { if (tmp[i] == priv->cur_rate) - goto done; + break; + } + if (i == tmp_size) { + lbs_pr_alert("Previously set fixed data rate %#x isn't " + "compatible with the network.\n", + priv->cur_rate); + return -1; } - lbs_pr_alert("Previously set fixed data rate %#x isn't " - "compatible with the network.\n", priv->cur_rate); - ret = -1; - goto done; } - ret = 0; - -done: - memset(rates, 0, *rates_size); - *rates_size = min_t(int, tmp_size, *rates_size); - memcpy(rates, tmp, *rates_size); kfree(tmp); - return ret; + return 0; } @@ -325,8 +324,8 @@ static int lbs_associate(struct lbs_private *priv, rates = (struct mrvl_ie_rates_param_set *) pos; rates->header.type = cpu_to_le16(TLV_TYPE_RATES); - memcpy(&rates->rates, &bss->rates, MAX_RATES); tmplen = MAX_RATES; + memcpy(&rates->rates, &bss->rates, tmplen); if (get_common_rates(priv, rates->rates, &tmplen)) { ret = -1; goto done; |