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authorVegard Nossum <vegard.nossum@gmail.com>2008-12-25 17:21:17 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-25 17:21:17 -0800
commit619e803d3c1b7bcc17c45e81f309d0b9b3df2d5d (patch)
treec2c279dd155e07e96c7a2f483cce6c48c1640cd6 /.gitignore
parent64ff3b938ec6782e6585a83d5459b98b0c3f6eb8 (diff)
netlink: fix (theoretical) overrun in message iteration
See commit 1045b03e07d85f3545118510a587035536030c1c ("netlink: fix overrun in attribute iteration") for a detailed explanation of why this patch is necessary. In short, nlmsg_next() can make "remaining" go negative, and the remaining >= sizeof(...) comparison will promote "remaining" to an unsigned type, which means that the expression will evaluate to true for negative numbers, even though it was not intended. I put "theoretical" in the title because I have no evidence that this can actually happen, but I suspect that a crafted netlink packet can trigger some badness. Note that the last test, which seemingly has the exact same problem (also true for nla_ok()), is perfectly OK, since we already know that remaining is positive. Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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