(trafficserver) branch master updated: Fix null pointer dereference in traffic_crashlog (#12756)

[bcall]

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bcall pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/trafficserver.git


The following commit(s) were added to refs/heads/master by this push:
     new 7f6f69775e Fix null pointer dereference in traffic_crashlog (#12756)
7f6f69775e is described below

commit 7f6f69775eeddc9211e3ab3b0cad9f4ad25869bd
Author: Bryan Call <bc...@apache.org>
AuthorDate: Mon Dec 15 14:27:26 2025 -0800

    Fix null pointer dereference in traffic_crashlog (#12756)
    
    ServerBacktrace() can return 0 (success) but leave the trace pointer
    null when the target process has already exited. This caused a SEGV
    when fprintf() was called with the null trace pointer.
    
    Add a null check before using the trace pointer.
---
 src/traffic_crashlog/traffic_crashlog.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/traffic_crashlog/traffic_crashlog.cc 
b/src/traffic_crashlog/traffic_crashlog.cc
index 65eee7bc50..9354c5f838 100644
--- a/src/traffic_crashlog/traffic_crashlog.cc
+++ b/src/traffic_crashlog/traffic_crashlog.cc
@@ -109,6 +109,11 @@ crashlog_write_backtrace(FILE *fp, pid_t pid, const 
crashlog_target &)
     return false;
   }
 
+  if (trace == nullptr) {
+    fprintf(fp, "Unable to retrieve backtrace: trace is null\n");
+    return false;
+  }
+
   fprintf(fp, "%s", trace);
   free(trace);
   return true;