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authorMatthias Kaehlcke <mka@chromium.org>2017-04-13 20:05:04 +0300
committerJohannes Berg <johannes.berg@intel.com>2017-04-18 12:02:18 +0300
commitaa1702dd162f420bf85ecef0c77686ef0dbc1496 (patch)
tree54de2141081fb66adb12f8583a66dbf9a7ebcac0 /net/wireless
parentf64331d58045b05e5af581284884d5df9b26c031 (diff)
downloadlinux-aa1702dd162f420bf85ecef0c77686ef0dbc1496.tar.xz
cfg80211: Fix array-bounds warning in fragment copy
__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. Initialize the pointer to array[0] and change the algorithm from increment before to increment after consume. Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/util.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 88f3a11dbcd3..a46bc42d0910 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;
@@ -672,10 +672,10 @@ __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
while (offset >= frag_size) {
offset -= frag_size;
- frag++;
frag_page = skb_frag_page(frag);
frag_ptr = skb_frag_address(frag);
frag_size = skb_frag_size(frag);
+ frag++;
}
frag_ptr += offset;
@@ -687,12 +687,12 @@ __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
len -= cur_len;
while (len > 0) {
- frag++;
frag_len = skb_frag_size(frag);
cur_len = min(len, frag_len);
__frame_add_frag(frame, skb_frag_page(frag),
skb_frag_address(frag), cur_len, frag_len);
len -= cur_len;
+ frag++;
}
}