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| author | Paolo Abeni <pabeni@redhat.com> | 2021-01-19 17:56:56 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-01-19 18:40:40 -0800 |
| commit | 00b229f762b020eebf55a52b984aec76ae0ad966 (patch) | |
| tree | 968d5b2e7ea5b3a40dfe048de6666b1a443768b2 /net/core/skbuff.c | |
| parent | fc6f89dd8c55cc756ebeff3d496218a2fbad3ec6 (diff) | |
| download | linux-00b229f762b020eebf55a52b984aec76ae0ad966.tar.bz2 | |
net: fix GSO for SG-enabled devices
The commit dbd50f238dec ("net: move the hsize check to the else
block in skb_segment") introduced a data corruption for devices
supporting scatter-gather.
The problem boils down to signed/unsigned comparison given
unexpected results: if signed 'hsize' is negative, it will be
considered greater than a positive 'len', which is unsigned.
This commit addresses resorting to the old checks order, so that
'hsize' never has a negative value when compared with 'len'.
v1 -> v2:
- reorder hsize checks instead of explicit cast (Alex)
Bisected-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Fixes: dbd50f238dec ("net: move the hsize check to the else block in skb_segment")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
Link: https://lore.kernel.org/r/861947c2d2d087db82af93c21920ce8147d15490.1611074818.git.pabeni@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/core/skbuff.c')
| -rw-r--r-- | net/core/skbuff.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index e835193cabcc..cf2c4dcf4257 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -3938,10 +3938,10 @@ normal: skb_release_head_state(nskb); __skb_push(nskb, doffset); } else { + if (hsize < 0) + hsize = 0; if (hsize > len || !sg) hsize = len; - else if (hsize < 0) - hsize = 0; nskb = __alloc_skb(hsize + doffset + headroom, GFP_ATOMIC, skb_alloc_rx_flag(head_skb), |