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| author |   Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2019-07-04 20:04:42 +0530 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-08-30 16:49:07 -0400 |
| commit | 5b0022dd32b7c2e15edf1827ba80aa1407edf9ff (patch) | |
| tree | b7e6fca3afb0ed19eaa69acb4115f62b41913f82 /kernel | |
| parent | ftrace: Check for empty hash and comment the race with registering probes (diff) | |
| download | linux-dev-5b0022dd32b7c2e15edf1827ba80aa1407edf9ff.tar.xz linux-dev-5b0022dd32b7c2e15edf1827ba80aa1407edf9ff.zip | |
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: 1ec3a81a0cf42 ("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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/ftrace.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 6200a6fe10e3..f9821a3374e9 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -4338,6 +4338,11 @@ register_ftrace_function_probe(char *glob, struct trace_array *tr, old_hash = *orig_hash; hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, old_hash); + if (!hash) { + ret = -ENOMEM; + goto out; + } + ret = ftrace_match_records(hash, glob, strlen(glob)); /* Nothing found? */ |