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riscv: fix integer wraparound in memcpy

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This patch fixes a bug in RISC-V's memcpy implementation where an
integer wraparound occurs when src + size < 8 * sizeof(long), causing
the word-sized copy loop to be incorrectly entered.

Signed-off-by: Chih-Mao Chen <cmchen@andestech.com>
This commit is contained in:
PkmX via Newlib 2020-07-24 19:07:45 +08:00 committed by Ken Brown
parent f05323bef0
commit 5e145c08ba
1 changed files with 2 additions and 2 deletions
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4
newlib/libc/machine/riscv/memcpy.c
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@ -51,9 +51,9 @@ small:
const long *lb = (const long *)b; const long *lb = (const long *)b;
long *lend = (long *)((uintptr_t)end & ~msk); long *lend = (long *)((uintptr_t)end & ~msk);
if (unlikely (la < (lend - 8))) if (unlikely (lend - la > 8))
{ {
while (la < (lend - 8)) while (lend - la > 8)
{ {
long b0 = *lb++; long b0 = *lb++;
long b1 = *lb++; long b1 = *lb++;