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xiaoxiang781216 pushed a commit to branch releases/13.1
in repository https://gitbox.apache.org/repos/asf/nuttx.git
The following commit(s) were added to refs/heads/releases/13.1 by this push:
new ad4a57d93e9 net: preserve checksum state for empty fragments
ad4a57d93e9 is described below
commit ad4a57d93e9011ece59ee291dab5ea8f4fbd271e
Author: Megha Rajput <[email protected]>
AuthorDate: Thu Sep 3 16:11:30 2026 +0000
net: preserve checksum state for empty fragments
checksum() accesses data[0] and calculates an invalid last_byte
pointer when processing an empty fragment with odd state set.
Return early when len is zero to preserve the checksum state and
avoid accessing data from an empty fragment.
Assisted by: GitHub Copilot
Signed-off-by: Megha Rajput <[email protected]>
---
net/utils/net_chksum.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/net/utils/net_chksum.c b/net/utils/net_chksum.c
index 169c4b7c1bf..6079a7d4e22 100644
--- a/net/utils/net_chksum.c
+++ b/net/utils/net_chksum.c
@@ -61,6 +61,11 @@ uint16_t checksum(uint16_t sum, FAR const uint8_t *data,
FAR const uint8_t *last_byte;
uint16_t t;
+ if (len == 0)
+ {
+ return sum;
+ }
+
dataptr = data;
last_byte = data + len - 1;
