trace: fix SIGSEGV after pop 2 #160
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Calling `trace_pop_target()` invalidates the linked list of `target_stack_node_t`s by `free()`ing the node and its `p_target`. But `p_stack_top` may still points at that now freed node. Entering the debugger will crash as it will start from `p_stack_top`. 1. Explicitly invalidate `p_target` by setting it to `NULL`. 2. Explicitly pop the top node from `p_stack_top` before calling `trace_pop_target()`. Closes: Trepan-Debuggers#158 Fixes: a86f3c0 ("trace: fix SIGSEGV after pop") Signed-off-by: Philipp Hahn <[email protected]>
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Seems a little hacky, but ok. |
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Calling
trace_pop_target()invalidates the linked list oftarget_stack_node_ts byfree()ing the node and itsp_target.But
p_stack_topmay still points at that now freed node. Entering the debugger will crash as it will start fromp_stack_top.p_targetby setting it toNULL.p_stack_topbefore callingtrace_pop_target().Closes: #158
Fixes: a86f3c0 ("trace: fix SIGSEGV after pop")