ftrace: Add cond_resched() to ftrace_graph_set_hash()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ftrace: Add cond_resched() to ftrace_graph_set_hash() When the kernel contains a large number of functions that can be traced, the loop in ftrace_graph_set_hash() may take a lot of time to execute. This may trigger the softlockup watchdog. Add cond_resched() within the loop to allow the kernel to remain responsive even when processing a large number of functions. This matches the cond_resched() that is used in other locations of the code that iterates over all functions that can be traced.

References

• https://git.kernel.org/stable/c/e5b4ae6f01d4a510d5725eca7254519a1093920d
• https://git.kernel.org/stable/c/618655d54c5f8af5d57b77491d08c0f0ff77d114
• https://git.kernel.org/stable/c/dd38803c9088b848c6b56f4f6d7efc4497bfde61
• https://git.kernel.org/stable/c/8dd7d7280357596ba63dfdb4c1725d9dd24bd42a
• https://git.kernel.org/stable/c/5d336ac215e5c76e43ef4bca9ba699835e53e2fd
• https://git.kernel.org/stable/c/1fce9574b9d515bcb8a75379a8053e18602424e3
• https://git.kernel.org/stable/c/4429535acab750d963fdc3dfcc9e0eee42f4d599
• https://git.kernel.org/stable/c/72be43ff061a889c6ee648a330a42486cafa15a6
• https://git.kernel.org/stable/c/42ea22e754ba4f2b86f8760ca27f6f71da2d982c