diff options
| author | Eric Dumazet <edumazet@google.com> | 2013-03-14 05:40:32 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-28 12:17:08 -0700 |
| commit | f4aef181feefd29c27a351f667d7e27bdafdd2c9 (patch) | |
| tree | 9fcb1341f9760c12b8d33fe37ff5dc45a24ed85e /include | |
| parent | 7c9704cafae8e1b2dde2c0758d093edafe7cb267 (diff) | |
tcp: fix skb_availroom()
[ Upstream commit 16fad69cfe4adbbfa813de516757b87bcae36d93 ]
Chrome OS team reported a crash on a Pixel ChromeBook in TCP stack :
https://code.google.com/p/chromium/issues/detail?id=182056
commit a21d45726acac (tcp: avoid order-1 allocations on wifi and tx
path) did a poor choice adding an 'avail_size' field to skb, while
what we really needed was a 'reserved_tailroom' one.
It would have avoided commit 22b4a4f22da (tcp: fix retransmit of
partially acked frames) and this commit.
Crash occurs because skb_split() is not aware of the 'avail_size'
management (and should not be aware)
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Mukesh Agrawal <quiche@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/skbuff.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 320e976d5ab..7cd88ac7b82 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -491,7 +491,7 @@ struct sk_buff { union { __u32 mark; __u32 dropcount; - __u32 avail_size; + __u32 reserved_tailroom; }; sk_buff_data_t inner_transport_header; @@ -1428,7 +1428,10 @@ static inline int skb_tailroom(const struct sk_buff *skb) */ static inline int skb_availroom(const struct sk_buff *skb) { - return skb_is_nonlinear(skb) ? 0 : skb->avail_size - skb->len; + if (skb_is_nonlinear(skb)) + return 0; + + return skb->end - skb->tail - skb->reserved_tailroom; } /** |