diff options
| author | Seth Forshee <seth.forshee@canonical.com> | 2011-02-14 08:52:25 -0600 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-02-14 15:50:17 -0500 |
| commit | d76dfc612b40b6a9de0a3fe57fe1fa3db7a1ae3b (patch) | |
| tree | 169aca14bd1a3514452aeac5170214280937a6eb /drivers/net/wireless/rt2x00/rt2800lib.c | |
| parent | a3dc5e881a8a5199bf371fdd4530cfa18280ca83 (diff) | |
rt2x00: Check for errors from skb_pad() calls
Commit 739fd94 ("rt2x00: Pad beacon to multiple of 32 bits")
added calls to skb_pad() without checking the return value,
which could cause problems if any of those calls does happen
to fail. Add checks to prevent this from happening.
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2800lib.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2800lib.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c index c9bf074342b..7a68a67c506 100644 --- a/drivers/net/wireless/rt2x00/rt2800lib.c +++ b/drivers/net/wireless/rt2x00/rt2800lib.c @@ -773,13 +773,14 @@ void rt2800_write_beacon(struct queue_entry *entry, struct txentry_desc *txdesc) struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); unsigned int beacon_base; unsigned int padding_len; - u32 reg; + u32 orig_reg, reg; /* * Disable beaconing while we are reloading the beacon data, * otherwise we might be sending out invalid data. */ rt2800_register_read(rt2x00dev, BCN_TIME_CFG, ®); + orig_reg = reg; rt2x00_set_field32(®, BCN_TIME_CFG_BEACON_GEN, 0); rt2800_register_write(rt2x00dev, BCN_TIME_CFG, reg); @@ -810,7 +811,14 @@ void rt2800_write_beacon(struct queue_entry *entry, struct txentry_desc *txdesc) * Write entire beacon with TXWI and padding to register. */ padding_len = roundup(entry->skb->len, 4) - entry->skb->len; - skb_pad(entry->skb, padding_len); + if (padding_len && skb_pad(entry->skb, padding_len)) { + ERROR(rt2x00dev, "Failure padding beacon, aborting\n"); + /* skb freed by skb_pad() on failure */ + entry->skb = NULL; + rt2800_register_write(rt2x00dev, BCN_TIME_CFG, orig_reg); + return; + } + beacon_base = HW_BEACON_OFFSET(entry->entry_idx); rt2800_register_multiwrite(rt2x00dev, beacon_base, entry->skb->data, entry->skb->len + padding_len); |