[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>
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 25772c3..05f263e 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -40,6 +40,8 @@
#include "lib/tfrc.h"
#include "ccid3.h"
+#include <asm/unaligned.h>
+
#ifdef CONFIG_IP_DCCP_CCID3_DEBUG
static int ccid3_debug;
#define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a)
@@ -544,6 +546,7 @@
const struct dccp_sock *dp = dccp_sk(sk);
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
struct ccid3_options_received *opt_recv;
+ __be32 opt_val;
opt_recv = &hctx->ccid3hctx_options_received;
@@ -563,8 +566,8 @@
dccp_role(sk), sk, len);
rc = -EINVAL;
} else {
- opt_recv->ccid3or_loss_event_rate =
- ntohl(*(__be32 *)value);
+ opt_val = get_unaligned((__be32 *)value);
+ opt_recv->ccid3or_loss_event_rate = ntohl(opt_val);
ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n",
dccp_role(sk), sk,
opt_recv->ccid3or_loss_event_rate);
@@ -585,8 +588,8 @@
dccp_role(sk), sk, len);
rc = -EINVAL;
} else {
- opt_recv->ccid3or_receive_rate =
- ntohl(*(__be32 *)value);
+ opt_val = get_unaligned((__be32 *)value);
+ opt_recv->ccid3or_receive_rate = ntohl(opt_val);
ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n",
dccp_role(sk), sk,
opt_recv->ccid3or_receive_rate);