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[dpdk-dev,3/7] net/i40e/base: fix potential out of bound array access

Message ID 1490174699-147026-4-git-send-email-jingjing.wu@intel.com (mailing list archive)
State Accepted, archived
Delegated to: Ferruh Yigit
Headers show

Checks

Context Check Description
ci/Intel-compilation success Compilation OK
ci/checkpatch success coding style OK

Commit Message

Wu, Jingjing March 22, 2017, 9:24 a.m. UTC
This is fix for klocwork issue where dcbcfg->numapps could
be greater than size of array (i.e dcbcfg->app[I40E_DCBX_MAX_APPS]).
The fix makes sure the array is not accessed past size of array
(i.e. I40E_DCBX_MAX_APPS).

Fixes: 166dceeeeafc ("i40e/base: add parsing for CEE DCBX TLVs")
Cc: stable@dpdk.org
Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
---
 drivers/net/i40e/base/i40e_dcb.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/net/i40e/base/i40e_dcb.c b/drivers/net/i40e/base/i40e_dcb.c
index 26c344f..9b5405d 100644
--- a/drivers/net/i40e/base/i40e_dcb.c
+++ b/drivers/net/i40e/base/i40e_dcb.c
@@ -396,6 +396,8 @@  static void i40e_parse_cee_app_tlv(struct i40e_cee_feat_tlv *tlv,
 	dcbcfg->numapps = length / sizeof(*app);
 	if (!dcbcfg->numapps)
 		return;
+	if (dcbcfg->numapps > I40E_DCBX_MAX_APPS)
+		dcbcfg->numapps = I40E_DCBX_MAX_APPS;
 
 	for (i = 0; i < dcbcfg->numapps; i++) {
 		u8 up, selector;