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-rw-r--r--exec.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/exec.c b/exec.c
index 2e2ced4..c0ea515 100644
--- a/exec.c
+++ b/exec.c
@@ -44,6 +44,7 @@ exec(char *path, char **argv)
goto bad;
}
iunlockput(ip);
+ ip = 0;
// Allocate a one-page stack at the next page boundary
sz = PGROUNDUP(sz);
@@ -105,6 +106,9 @@ exec(char *path, char **argv)
uint ffffffff = 0xffffffff;
copyout(pgdir, sp, &ffffffff, 4);
+ if(sp < sz - PGSIZE)
+ goto bad;
+
// Save program name for debugging.
for(last=s=path; *s; s++)
if(*s == '/')
@@ -125,8 +129,9 @@ exec(char *path, char **argv)
return 0;
bad:
- cprintf("kernel: exec failed\n");
- if(pgdir) freevm(pgdir);
- iunlockput(ip);
+ if(pgdir)
+ freevm(pgdir);
+ if(ip)
+ iunlockput(ip);
return -1;
}