ftrace: Check for successful allocation of hash
In register_ftrace_function_probe(), we are not checking the return
value of alloc_and_copy_ftrace_hash(). The subsequent call to
ftrace_match_records() may end up dereferencing the same. Add a check to
ensure this doesn't happen.
Link: http://lkml.kernel.org/r/26e92574f25ad23e7cafa3cf5f7a819de1832cbe.1562249521.git.naveen.n.rao@linux.vnet.ibm.com
Cc: stable@vger.kernel.org
Fixes: 1ec3a81a0c
("ftrace: Have each function probe use its own ftrace_ops")
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
parent
372e0d01da
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@ -4338,6 +4338,11 @@ register_ftrace_function_probe(char *glob, struct trace_array *tr,
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old_hash = *orig_hash;
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hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, old_hash);
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if (!hash) {
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ret = -ENOMEM;
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goto out;
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}
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ret = ftrace_match_records(hash, glob, strlen(glob));
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/* Nothing found? */
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