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authorLinus Torvalds <torvalds@linux-foundation.org>2011-12-26 10:25:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-12-26 10:25:26 -0800
commit6d4b9e38d3980826abccfbd90e95bf4bd41b8dd2 (patch)
tree7473e333fc5aae6dd1d4b7f86205a330818518ce /MAINTAINERS
parent4962516b2309d76964f9df0d33e74f43b624a42d (diff)
vfs: fix handling of lock allocation failure in lease-break case
Bruce Fields notes that commit 778fc546f749 ("locks: fix tracking of inprogress lease breaks") introduced a possible error pointer dereference on failure to allocate memory. locks_conflict() will dereference the passed-in new lease lock structure that may be an error pointer. This means an open (without O_NONBLOCK set) on a file with a lease applied (generally only done when Samba or nfsd (with v4) is running) could crash if a kmalloc() fails. So instead of playing games with IS_ERROR() all over the place, just check the allocation failure early. That makes the code more straightforward, and avoids this possible bad pointer dereference. Based-on-patch-by: J. Bruce Fields <bfields@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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