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Date: Thu, 12 Oct 2023 21:33:32 +0000
From: Justin Stitt <>
To: Thomas Sailer <>, "David S. Miller" <>, 
	Eric Dumazet <>, Jakub Kicinski <>, Paolo Abeni <>
	Justin Stitt <>
Subject: [PATCH] hamradio: replace deprecated strncpy with strscpy

strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string

We expect both and to be
NUL-terminated but not necessarily NUL-padded which is evident by its
usage with sprintf:
|       sprintf(, "%sclk,%smodem,fclk=%d,bps=%d%s",
|               bc->cfg.intclk ? "int" : "ext",
|               bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
|               bc->cfg.loopback ? ",loopback" : "");

Note that this data is copied out to userspace with:
|       if (copy_to_user(data, &hi, sizeof(hi)))
... however, the data was also copied FROM the user here:
|       if (copy_from_user(&hi, data, sizeof(hi)))

Considering the above, a suitable replacement is `strscpy` [2] due to
the fact that it guarantees NUL-termination on the destination buffer
without unnecessarily NUL-padding.

Link: [1]
Link: [2]
Signed-off-by: Justin Stitt <>
Note: build-tested only.

Also, there are 33 instances of trailing whitespace in this file alone.
I've opted to not remove them in this patch.
 drivers/net/hamradio/baycom_epp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c
index 83ff882f5d97..30a0fbb12b9c 100644
--- a/drivers/net/hamradio/baycom_epp.c
+++ b/drivers/net/hamradio/baycom_epp.c
@@ -1074,7 +1074,7 @@ static int baycom_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
 		return 0;
-		strncpy(, "baycom_epp", sizeof(;
+		strscpy(, "baycom_epp", sizeof(;
@@ -1091,7 +1091,7 @@ static int baycom_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
 		return baycom_setmode(bc,;
-		strncpy(, "intclk,extclk,intmodem,extmodem,divider=x",
+		strscpy(, "intclk,extclk,intmodem,extmodem,divider=x",

base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231012-strncpy-drivers-net-hamradio-baycom_epp-c-6e11c9483b9f

Best regards,
Justin Stitt <>

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