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fix memory region validation in argptr()

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MikeCAT 2015-12-19 22:52:11 +09:00 committed by Frans Kaashoek
parent 0df5f11bae
commit 2a675089b1
1 changed files with 1 additions and 1 deletions
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2
syscall.c
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@ -58,7 +58,7 @@ argptr(int n, char **pp, int size)
if(argint(n, &i) < 0)
return -1;
if((uint)i >= proc->sz || (uint)i+size > proc->sz)
if(size < 0 || (uint)i >= proc->sz || (uint)i+size > proc->sz)
return -1;
*pp = (char*)i;
return 0;