[PATCH 2/2] ftrace: Check for successful allocation of hash

[Naveen N. Rao]

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.

Signed-off-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
---
 kernel/trace/ftrace.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 0791eafb693d..0d5f7d4a4936 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -4328,6 +4328,11 @@ 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? */
-- 
2.22.0