diff options
| -rw-r--r-- | kernel/signal.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index dff04d7d6dc55c..e392acc5472833 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1143,11 +1143,9 @@ do_sigaltstack (const stack_t *uss, stack_t *uoss, unsigned long sp) stack_t oss; int error; - if (uoss) { - oss.ss_sp = (void *) current->sas_ss_sp; - oss.ss_size = current->sas_ss_size; - oss.ss_flags = sas_ss_flags(sp); - } + oss.ss_sp = (void *) current->sas_ss_sp; + oss.ss_size = current->sas_ss_size; + oss.ss_flags = sas_ss_flags(sp); if (uss) { void *ss_sp; @@ -1190,13 +1188,16 @@ do_sigaltstack (const stack_t *uss, stack_t *uoss, unsigned long sp) current->sas_ss_size = ss_size; } + error = 0; if (uoss) { error = -EFAULT; - if (copy_to_user(uoss, &oss, sizeof(oss))) + if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))) goto out; + error = __put_user(oss.ss_sp, &uoss->ss_sp) | + __put_user(oss.ss_size, &uoss->ss_size) | + __put_user(oss.ss_flags, &uoss->ss_flags); } - error = 0; out: return error; } |