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-rw-r--r--exec.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/exec.c b/exec.c
index e5d1816..d56ee1d 100644
--- a/exec.c
+++ b/exec.c
@@ -44,6 +44,8 @@ exec(char *path, char **argv)
continue;
if(ph.memsz < ph.filesz)
goto bad;
+ if(ph.vaddr + ph.memsz < ph.vaddr)
+ goto bad;
if((sz = allocuvm(pgdir, sz, ph.vaddr + ph.memsz)) == 0)
goto bad;
if(ph.vaddr % PGSIZE != 0)