From: Jesse Brandeburg Date: Sat, 28 Sep 2013 07:13:39 +0000 (+0000) Subject: i40e: clamp debugfs nvm read command X-Git-Tag: v5.15~18996^2~141^2~8 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=520dfd8b09dc9f4da6499b93ef0db7166746e8c3;p=platform%2Fkernel%2Flinux-starfive.git i40e: clamp debugfs nvm read command This issue was identified by the coverity checker where we were not checking the upper limit on reads, reported by Hannes Frederic Sowa. Implement more specific limits on reads (min 1k, max 4k) Signed-off-by: Jesse Brandeburg CC: Hannes Frederic Sowa Tested-by: Kavindya Deegala Signed-off-by: Jeff Kirsher --- diff --git a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c index 304f39d..c80fcb4 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c +++ b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c @@ -1742,11 +1742,13 @@ static ssize_t i40e_dbg_command_write(struct file *filp, goto command_write_done; } - /* Read at least 512 words */ - if (buffer_len == 0) - buffer_len = 512; + /* set the max length */ + buffer_len = min_t(u16, buffer_len, I40E_MAX_AQ_BUF_SIZE/2); bytes = 2 * buffer_len; + + /* read at least 1k bytes, no more than 4kB */ + bytes = clamp(bytes, (u16)1024, (u16)I40E_MAX_AQ_BUF_SIZE); buff = kzalloc(bytes, GFP_KERNEL); if (!buff) goto command_write_done;