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| author | Li RongQing <lirongqing@baidu.com> | 2020-04-02 15:52:10 +0800 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2020-04-06 21:48:05 +0200 |
| commit | db5c97f02373917efe2c218ebf8e3d8b19e343b6 (patch) | |
| tree | 20fda0873765ba42e4ab7b59f6ee1de2e933fde1 /net/xdp | |
| parent | 5222d69642a09261222fb9703761a029db16cadf (diff) | |
| download | linux-db5c97f02373917efe2c218ebf8e3d8b19e343b6.tar.bz2 | |
xsk: Fix out of boundary write in __xsk_rcv_memcpy
first_len is the remainder of the first page we're copying.
If this size is larger, then out of page boundary write will
otherwise happen.
Fixes: c05cd3645814 ("xsk: add support to allow unaligned chunk placement")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Link: https://lore.kernel.org/bpf/1585813930-19712-1-git-send-email-lirongqing@baidu.com
Diffstat (limited to 'net/xdp')
| -rw-r--r-- | net/xdp/xsk.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index 356f90e4522b..c350108aa38d 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -131,8 +131,9 @@ static void __xsk_rcv_memcpy(struct xdp_umem *umem, u64 addr, void *from_buf, u64 page_start = addr & ~(PAGE_SIZE - 1); u64 first_len = PAGE_SIZE - (addr - page_start); - memcpy(to_buf, from_buf, first_len + metalen); - memcpy(next_pg_addr, from_buf + first_len, len - first_len); + memcpy(to_buf, from_buf, first_len); + memcpy(next_pg_addr, from_buf + first_len, + len + metalen - first_len); return; } |