On Mon, Dec 20, 2010 at 02:00:41PM +0530, Dan Carpenter wrote:
> Hello Vasanthakumar,
>
> Smatch complains that in linux-next 60e0c3a7 "ath9k_hw: Eeeprom changes
> for AR9485" means there is a potential read past the end of the buffer
> int ar9300_eeprom_restore_internal().
>
> drivers/net/wireless/ath/ath9k/ar9003_eeprom.c +3381
> ar9300_eeprom_restore_internal(81)
> error: buffer overflow 'word' 2048 <= 4099
>
> "word" is allocated with 2048 bytes:
> word = kzalloc(2048, GFP_KERNEL);
>
> "length" can be up to 4099:
> if ((!AR_SREV_9485(ah) && length >= 1024) ||
> (AR_SREV_9485(ah) && length >= (4 * 1024))) {
> ^^^^^^^^^^^^^^^^^^^^^
>
> so "osize" can be up to 4099 as well:
> osize = length;
>
> We're reading way past the end of the word array here:
> mchecksum = word[COMP_HDR_LEN + osize] |
> ^^^^^^^^^^^^^^^^^^^^^^^^^^
> (word[COMP_HDR_LEN + osize + 1] << 8);
>
> I don't know how to fix this. Can you take a look?
thanks for pointing this out. we shall look into this.
>
> regards,
> dan carpenter
>
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