diff mbox series

net: mctp i2c: Copy headers if cloned

Message ID 20250306-matt-mctp-i2c-cow-v1-1-293827212681@codeconstruct.com.au (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series net: mctp i2c: Copy headers if cloned | expand

Checks

Context Check Description
netdev/series_format warning Single patches do not need cover letters; Target tree name not specified in the subject
netdev/tree_selection success Guessed tree name to be net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 8 of 8 maintainers
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 17 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2025-03-06--03-00 (tests: 894)

Commit Message

Matt Johnston March 6, 2025, 2:33 a.m. UTC 
Use skb_cow_head() prior to modifying the TX SKB. This is necessary
when the SKB has been cloned, to avoid modifying other shared clones.

Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Fixes: f5b8abf9fc3d ("mctp i2c: MCTP I2C binding driver")
---
 drivers/net/mctp/mctp-i2c.c | 5 +++++
 1 file changed, 5 insertions(+)


---
base-commit: 3c9231ea6497dfc50ac0ef69fff484da27d0df66
change-id: 20250306-matt-mctp-i2c-cow-e9f028942734

Best regards,
diff mbox series

Patch

diff --git a/drivers/net/mctp/mctp-i2c.c b/drivers/net/mctp/mctp-i2c.c
index e3dcdeacc12c590c0790c9425eb2d997937c1bb9..d74d47dd6e04dcf4163bb8cdc446dc3c649880d2 100644
--- a/drivers/net/mctp/mctp-i2c.c
+++ b/drivers/net/mctp/mctp-i2c.c
@@ -583,6 +583,7 @@  static int mctp_i2c_header_create(struct sk_buff *skb, struct net_device *dev,
 	struct mctp_i2c_hdr *hdr;
 	struct mctp_hdr *mhdr;
 	u8 lldst, llsrc;
+	int rc;
 
 	if (len > MCTP_I2C_MAXMTU)
 		return -EMSGSIZE;
@@ -593,6 +594,10 @@  static int mctp_i2c_header_create(struct sk_buff *skb, struct net_device *dev,
 	lldst = *((u8 *)daddr);
 	llsrc = *((u8 *)saddr);
 
+	rc = skb_cow_head(skb, sizeof(struct mctp_i2c_hdr));
+	if (rc)
+		return rc;
+
 	skb_push(skb, sizeof(struct mctp_i2c_hdr));
 	skb_reset_mac_header(skb);
 	hdr = (void *)skb_mac_header(skb);