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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2007-10-24 10:46:58 -0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@ghostprotocols.net> | 2007-10-24 10:46:58 -0200 |
| commit | 76fd1e87d9456c8185b8df76ac5e533e0c8b39bb (patch) | |
| tree | 2706975f5e479de467afd959d68866dd12bbb363 /net/dccp/options.c | |
| parent | d8ef2c29a0dcfccb2d90cac990143d1a4668708a (diff) | |
| download | linux-76fd1e87d9456c8185b8df76ac5e533e0c8b39bb.tar.bz2 | |
[DCCP]: Unaligned pointer access
This fixes `unaligned (read) access' errors of the type
Kernel unaligned access at TPC[100f970c] dccp_parse_options+0x4f4/0x7e0 [dccp]
Kernel unaligned access at TPC[1011f2e4] ccid3_hc_tx_parse_options+0x1ac/0x380 [dccp_ccid3]
Kernel unaligned access at TPC[100f9898] dccp_parse_options+0x680/0x880 [dccp]
by using the get_unaligned macro for parsing options.
Commiter note: Preserved the sparse __be{16,32} annotations.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'net/dccp/options.c')
| -rw-r--r-- | net/dccp/options.c | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/net/dccp/options.c b/net/dccp/options.c index d361b5533309..d286cffe2c49 100644 --- a/net/dccp/options.c +++ b/net/dccp/options.c @@ -14,6 +14,7 @@ #include <linux/dccp.h> #include <linux/module.h> #include <linux/types.h> +#include <asm/unaligned.h> #include <linux/kernel.h> #include <linux/skbuff.h> @@ -59,6 +60,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb) unsigned char opt, len; unsigned char *value; u32 elapsed_time; + __be32 opt_val; int rc; int mandatory = 0; @@ -145,7 +147,8 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb) if (len != 4) goto out_invalid_option; - opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value); + opt_val = get_unaligned((__be32 *)value); + opt_recv->dccpor_timestamp = ntohl(opt_val); dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; dp->dccps_timestamp_time = ktime_get_real(); @@ -159,7 +162,8 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb) if (len != 4 && len != 6 && len != 8) goto out_invalid_option; - opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value); + opt_val = get_unaligned((__be32 *)value); + opt_recv->dccpor_timestamp_echo = ntohl(opt_val); dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, " "ackno=%llu", dccp_role(sk), @@ -168,16 +172,20 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb) (unsigned long long) DCCP_SKB_CB(skb)->dccpd_ack_seq); + value += 4; - if (len == 4) { + if (len == 4) { /* no elapsed time included */ dccp_pr_debug_cat("\n"); break; } - if (len == 6) - elapsed_time = ntohs(*(__be16 *)(value + 4)); - else - elapsed_time = ntohl(*(__be32 *)(value + 4)); + if (len == 6) { /* 2-byte elapsed time */ + __be16 opt_val2 = get_unaligned((__be16 *)value); + elapsed_time = ntohs(opt_val2); + } else { /* 4-byte elapsed time */ + opt_val = get_unaligned((__be32 *)value); + elapsed_time = ntohl(opt_val); + } dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time); @@ -192,10 +200,13 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb) if (pkt_type == DCCP_PKT_DATA) continue; - if (len == 2) - elapsed_time = ntohs(*(__be16 *)value); - else - elapsed_time = ntohl(*(__be32 *)value); + if (len == 2) { + __be16 opt_val2 = get_unaligned((__be16 *)value); + elapsed_time = ntohs(opt_val2); + } else { + opt_val = get_unaligned((__be32 *)value); + elapsed_time = ntohl(opt_val); + } if (elapsed_time > opt_recv->dccpor_elapsed_time) opt_recv->dccpor_elapsed_time = elapsed_time; |