lkml.org 
[lkml]   [2017]   [Mar]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] cfg80211: Fix array-bounds warning in fragment copy
Date
__ieee80211_amsdu_copy_frag intentionally initializes a pointer to
array[-1] to increment it later to valid values. clang rightfully
generates an array-bounds warning on the initialization statement.
Work around this by initializing the pointer to array[0] and
decrementing it later, which allows to leave the rest of the
algorithm untouched.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
---
net/wireless/util.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 68e5f2ecee1a..d3d459e4a070 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -659,7 +659,7 @@ __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
int offset, int len)
{
struct skb_shared_info *sh = skb_shinfo(skb);
- const skb_frag_t *frag = &sh->frags[-1];
+ const skb_frag_t *frag = &sh->frags[0];
struct page *frag_page;
void *frag_ptr;
int frag_len, frag_size;
@@ -669,6 +669,7 @@ __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
frag_page = virt_to_head_page(skb->head);
frag_ptr = skb->data;
frag_size = head_size;
+ frag--;

while (offset >= frag_size) {
offset -= frag_size;
--
2.12.1.578.ge9c3154ca4-goog
\
 
 \ /
  Last update: 2017-03-25 02:08    [W:0.167 / U:0.176 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site