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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2013-07-23 22:06:15 -0400
committerSteven Rostedt <rostedt@rostedt.homelinux.com>2013-07-24 11:22:54 -0400
commit195a8afc7ac962f8da795549fe38e825f1372b0d (patch)
tree5997b7318d7e41cf07bc27c3a828481f745d5fab /lib/locking-selftest-softirq.h
parent9c01fe4593db123c5a72dc36f0400f776e92c954 (diff)
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op-kernel-dev-195a8afc7ac962f8da795549fe38e825f1372b0d.tar.gz
ftrace: Add check for NULL regs if ops has SAVE_REGS set
If a ftrace ops is registered with the SAVE_REGS flag set, and there's already a ops registered to one of its functions but without the SAVE_REGS flag, there's a small race window where the SAVE_REGS ops gets added to the list of callbacks to call for that function before the callback trampoline gets set to save the regs. The problem is, the function is not currently saving regs, which opens a small race window where the ops that is expecting regs to be passed to it, wont. This can cause a crash if the callback were to reference the regs, as the SAVE_REGS guarantees that regs will be set. To fix this, we add a check in the loop case where it checks if the ops has the SAVE_REGS flag set, and if so, it will ignore it if regs is not set. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'lib/locking-selftest-softirq.h')
0 files changed, 0 insertions, 0 deletions
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