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authorHelmut Schaa <helmut.schaa@googlemail.com>2010-12-02 12:44:09 -0500
committerJohn W. Linville <linville@tuxdriver.com>2010-12-08 15:23:48 -0500
commit7e2447075690860e2cea96b119fc9cadbaa7e83c (patch)
tree1bede27944240867d96e0440fbadb254b04368cd /net/mac80211/tx.c
parentf933ebed7888a9a7d73ebeeb6bcbb3f710c423b4 (diff)
mac80211: Fix BUG in pskb_expand_head when transmitting shared skbs
mac80211 doesn't handle shared skbs correctly at the moment. As a result a possible resize can trigger a BUG in pskb_expand_head. [ 676.030000] Kernel bug detected[#1]: [ 676.030000] Cpu 0 [ 676.030000] $ 0 : 00000000 00000000 819662ff 00000002 [ 676.030000] $ 4 : 81966200 00000020 00000000 00000020 [ 676.030000] $ 8 : 819662e0 800043c0 00000002 00020000 [ 676.030000] $12 : 3b9aca00 00000000 00000000 00470000 [ 676.030000] $16 : 80ea2000 00000000 00000000 00000000 [ 676.030000] $20 : 818aa200 80ea2018 80ea2000 00000008 [ 676.030000] $24 : 00000002 800ace5c [ 676.030000] $28 : 8199a000 8199bd20 81938f88 80f180d4 [ 676.030000] Hi : 0000026e [ 676.030000] Lo : 0000757e [ 676.030000] epc : 801245e4 pskb_expand_head+0x44/0x1d8 [ 676.030000] Not tainted [ 676.030000] ra : 80f180d4 ieee80211_skb_resize+0xb0/0x114 [mac80211] [ 676.030000] Status: 1000a403 KERNEL EXL IE [ 676.030000] Cause : 10800024 [ 676.030000] PrId : 0001964c (MIPS 24Kc) [ 676.030000] Modules linked in: mac80211_hwsim rt2800lib rt2x00soc rt2x00pci rt2x00lib mac80211 crc_itu_t crc_ccitt cfg80211 compat arc4 aes_generic deflate ecb cbc [last unloaded: rt2800pci] [ 676.030000] Process kpktgend_0 (pid: 97, threadinfo=8199a000, task=81879f48, tls=00000000) [ 676.030000] Stack : ffffffff 00000000 00000000 00000014 00000004 80ea2000 00000000 00000000 [ 676.030000] 818aa200 80f180d4 ffffffff 0000000a 81879f78 81879f48 81879f48 00000018 [ 676.030000] 81966246 80ea2000 818432e0 80f1a420 80203050 81814d98 00000001 81879f48 [ 676.030000] 81879f48 00000018 81966246 818432e0 0000001a 8199bdd4 0000001c 80f1b72c [ 676.030000] 80203020 8001292c 80ef4aa2 7f10b55d 801ab5b8 81879f48 00000188 80005c90 [ 676.030000] ... [ 676.030000] Call Trace: [ 676.030000] [<801245e4>] pskb_expand_head+0x44/0x1d8 [ 676.030000] [<80f180d4>] ieee80211_skb_resize+0xb0/0x114 [mac80211] [ 676.030000] [<80f1a420>] ieee80211_xmit+0x150/0x22c [mac80211] [ 676.030000] [<80f1b72c>] ieee80211_subif_start_xmit+0x6f4/0x73c [mac80211] [ 676.030000] [<8014361c>] pktgen_thread_worker+0xfac/0x16f8 [ 676.030000] [<8002ebe8>] kthread+0x7c/0x88 [ 676.030000] [<80008e0c>] kernel_thread_helper+0x10/0x18 [ 676.030000] [ 676.030000] [ 676.030000] Code: 24020001 10620005 2502001f <0200000d> 0804917a 00000000 2502001f 00441023 00531021 Fix this by making a local copy of shared skbs prior to mangeling them. To avoid copying the skb unnecessarily move the skb_copy call below the checks that don't need write access to the skb. Also, move the assignment of nh_pos and h_pos below the skb_copy to point to the correct skb. It would be possible to avoid another resize of the copied skb by using skb_copy_expand instead of skb_copy but that would make the patch more complex. Also, shared skbs are a corner case right now, so the resize shouldn't matter much. Cc: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com> Cc: stable@kernel.org Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/tx.c')
-rw-r--r--net/mac80211/tx.c21
1 files changed, 18 insertions, 3 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index df6aac523532..7a637b80a62e 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1737,15 +1737,13 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1737 int nh_pos, h_pos; 1737 int nh_pos, h_pos;
1738 struct sta_info *sta = NULL; 1738 struct sta_info *sta = NULL;
1739 u32 sta_flags = 0; 1739 u32 sta_flags = 0;
1740 struct sk_buff *tmp_skb;
1740 1741
1741 if (unlikely(skb->len < ETH_HLEN)) { 1742 if (unlikely(skb->len < ETH_HLEN)) {
1742 ret = NETDEV_TX_OK; 1743 ret = NETDEV_TX_OK;
1743 goto fail; 1744 goto fail;
1744 } 1745 }
1745 1746
1746 nh_pos = skb_network_header(skb) - skb->data;
1747 h_pos = skb_transport_header(skb) - skb->data;
1748
1749 /* convert Ethernet header to proper 802.11 header (based on 1747 /* convert Ethernet header to proper 802.11 header (based on
1750 * operation mode) */ 1748 * operation mode) */
1751 ethertype = (skb->data[12] << 8) | skb->data[13]; 1749 ethertype = (skb->data[12] << 8) | skb->data[13];
@@ -1918,6 +1916,20 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1918 goto fail; 1916 goto fail;
1919 } 1917 }
1920 1918
1919 /*
1920 * If the skb is shared we need to obtain our own copy.
1921 */
1922 if (skb_shared(skb)) {
1923 tmp_skb = skb;
1924 skb = skb_copy(skb, GFP_ATOMIC);
1925 kfree_skb(tmp_skb);
1926
1927 if (!skb) {
1928 ret = NETDEV_TX_OK;
1929 goto fail;
1930 }
1931 }
1932
1921 hdr.frame_control = fc; 1933 hdr.frame_control = fc;
1922 hdr.duration_id = 0; 1934 hdr.duration_id = 0;
1923 hdr.seq_ctrl = 0; 1935 hdr.seq_ctrl = 0;
@@ -1936,6 +1948,9 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1936 encaps_len = 0; 1948 encaps_len = 0;
1937 } 1949 }
1938 1950
1951 nh_pos = skb_network_header(skb) - skb->data;
1952 h_pos = skb_transport_header(skb) - skb->data;
1953
1939 skb_pull(skb, skip_header_bytes); 1954 skb_pull(skb, skip_header_bytes);
1940 nh_pos -= skip_header_bytes; 1955 nh_pos -= skip_header_bytes;
1941 h_pos -= skip_header_bytes; 1956 h_pos -= skip_header_bytes;