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net: sched: Replace strlcpy with strscpy

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strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().

Direct replacement is safe here since return value of -errno
is used to check for truncation instead of sizeof(dest).

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Azeem Shaikh 2023-07-10 03:07:11 +00:00 committed by David S. Miller
parent 87355b7c3d
commit 989b52cdc8
1 changed files with 1 additions and 1 deletions
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2
net/sched/act_api.c
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@ -1320,7 +1320,7 @@ struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police,
return ERR_PTR(err); return ERR_PTR(err);
} }
} else { } else {
if (strlcpy(act_name, "police", IFNAMSIZ) >= IFNAMSIZ) { if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
NL_SET_ERR_MSG(extack, "TC action name too long"); NL_SET_ERR_MSG(extack, "TC action name too long");
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
} }