diff options
Diffstat (limited to 'arch/alpha/lib/csum_partial_copy.c')
| -rw-r--r-- | arch/alpha/lib/csum_partial_copy.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/arch/alpha/lib/csum_partial_copy.c b/arch/alpha/lib/csum_partial_copy.c index f363dc89fcbe..3c0e89c39ddb 100644 --- a/arch/alpha/lib/csum_partial_copy.c +++ b/arch/alpha/lib/csum_partial_copy.c @@ -325,30 +325,27 @@ csum_partial_cfu_unaligned(const unsigned long __user * src, } __wsum -csum_and_copy_from_user(const void __user *src, void *dst, int len, - __wsum sum, int *errp) +csum_and_copy_from_user(const void __user *src, void *dst, int len) { - unsigned long checksum = (__force u32) sum; + unsigned long checksum = ~0U; unsigned long soff = 7 & (unsigned long) src; unsigned long doff = 7 & (unsigned long) dst; + int err = 0; if (len) { - if (!access_ok(src, len)) { - if (errp) *errp = -EFAULT; - memset(dst, 0, len); - return sum; - } + if (!access_ok(src, len)) + return 0; if (!doff) { if (!soff) checksum = csum_partial_cfu_aligned( (const unsigned long __user *) src, (unsigned long *) dst, - len-8, checksum, errp); + len-8, checksum, &err); else checksum = csum_partial_cfu_dest_aligned( (const unsigned long __user *) src, (unsigned long *) dst, - soff, len-8, checksum, errp); + soff, len-8, checksum, &err); } else { unsigned long partial_dest; ldq_u(partial_dest, dst); @@ -357,15 +354,15 @@ csum_and_copy_from_user(const void __user *src, void *dst, int len, (const unsigned long __user *) src, (unsigned long *) dst, doff, len-8, checksum, - partial_dest, errp); + partial_dest, &err); else checksum = csum_partial_cfu_unaligned( (const unsigned long __user *) src, (unsigned long *) dst, soff, doff, len-8, checksum, - partial_dest, errp); + partial_dest, &err); } - checksum = from64to16 (checksum); + checksum = err ? 0 : from64to16 (checksum); } return (__force __wsum)checksum; } @@ -378,7 +375,7 @@ csum_partial_copy_nocheck(const void *src, void *dst, int len) mm_segment_t oldfs = get_fs(); set_fs(KERNEL_DS); checksum = csum_and_copy_from_user((__force const void __user *)src, - dst, len, 0, NULL); + dst, len); set_fs(oldfs); return checksum; } |