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authorAl Viro <viro@ZenIV.linux.org.uk>2017-02-19 07:15:27 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-19 09:54:31 -0800
commit137d01df511b3afe1f05499aea05f3bafc0fb221 (patch)
treeafb1bebd5515d5a1642bb9afb6adcd23d0fd6e6d /Makefile
parentfd3fc0b4d7305fa7246622dcc0dec69c42443f45 (diff)
Fix missing sanity check in /dev/sg
What happens is that a write to /dev/sg is given a request with non-zero ->iovec_count combined with zero ->dxfer_len. Or with ->dxferp pointing to an array full of empty iovecs. Having write permission to /dev/sg shouldn't be equivalent to the ability to trigger BUG_ON() while holding spinlocks... Found by Dmitry Vyukov and syzkaller. [ The BUG_ON() got changed to a WARN_ON_ONCE(), but this fixes the underlying issue. - Linus ] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Reported-by: Dmitry Vyukov <dvyukov@google.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Makefile')
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