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-rw-r--r--include/linux/fortify-string.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/fortify-string.h b/include/linux/fortify-string.h
index 49782f63f015..32a66d4b30ca 100644
--- a/include/linux/fortify-string.h
+++ b/include/linux/fortify-string.h
@@ -314,6 +314,16 @@ __FORTIFY_INLINE ssize_t strscpy(char * const POS p, const char * const POS q, s
if (__compiletime_lessthan(p_size, size))
__write_overflow();
+ /* Short-circuit for compile-time known-safe lengths. */
+ if (__compiletime_lessthan(p_size, SIZE_MAX)) {
+ len = __compiletime_strlen(q);
+
+ if (len < SIZE_MAX && __compiletime_lessthan(len, size)) {
+ __underlying_memcpy(p, q, len + 1);
+ return len;
+ }
+ }
+
/*
* This call protects from read overflow, because len will default to q
* length if it smaller than size.