From: Patrick McHardy Date: Tue, 5 Jul 2005 21:08:10 +0000 (-0700) Subject: [NET]: Fix signedness issues in net/core/filter.c X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=55820ee2f8c767a2833b21bd365e5753f50bd8ce;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [NET]: Fix signedness issues in net/core/filter.c This is the code to load packet data into a register: k = fentry->k; if (k < 0) { ... } else { u32 _tmp, *p; p = skb_header_pointer(skb, k, 4, &_tmp); if (p != NULL) { A = ntohl(*p); continue; } } skb_header_pointer checks if the requested data is within the linear area: int hlen = skb_headlen(skb); if (offset + len <= hlen) return skb->data + offset; When offset is within [INT_MAX-len+1..INT_MAX] the addition will result in a negative number which is <= hlen. I couldn't trigger a crash on my AMD64 with 2GB of memory, but a coworker tried on his x86 machine and it crashed immediately. This patch fixes the check in skb_header_pointer to handle large positive offsets similar to skb_copy_bits. Invalid data can still be accessed using negative offsets (also similar to skb_copy_bits), anyone using negative offsets needs to verify them himself. Thanks to Thomas Vögtle for verifying the problem by crashing his machine and providing me with an Oops. Signed-off-by: Patrick McHardy Acked-by: Herbert Xu Signed-off-by: David S. Miller --- diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 416a2e4024b2..fbcb18651970 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1211,7 +1211,7 @@ static inline void *skb_header_pointer(const struct sk_buff *skb, int offset, { int hlen = skb_headlen(skb); - if (offset + len <= hlen) + if (hlen - offset >= len) return skb->data + offset; if (skb_copy_bits(skb, offset, buffer, len) < 0)