[PATCH v3 1/9] net/tcp: fix TCP options processing
Mikhail Kshevetskiy
mikhail.kshevetskiy at iopsys.eu
Wed Jul 31 11:21:02 CEST 2024
Current TCP code may miss an option if TCP_O_NOP option was used before
it for proper aligning.
Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
---
net/tcp.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/tcp.c b/net/tcp.c
index b0cc8a1fe3e..3e3118de450 100644
--- a/net/tcp.c
+++ b/net/tcp.c
@@ -475,7 +475,7 @@ void tcp_parse_options(uchar *o, int o_len)
* NOPs are options with a zero length, and thus are special.
* All other options have length fields.
*/
- for (p = o; p < (o + o_len); p = p + p[1]) {
+ for (p = o; p < (o + o_len); ) {
if (!p[1])
return; /* Finished processing options */
@@ -490,12 +490,14 @@ void tcp_parse_options(uchar *o, int o_len)
case TCP_O_TS:
tsopt = (struct tcp_t_opt *)p;
rmt_timestamp = tsopt->t_snd;
- return;
+ break;
}
/* Process optional NOPs */
if (p[0] == TCP_O_NOP)
p++;
+ else
+ p += p[1];
}
}
--
2.39.2
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