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author | Lancelot SIX <lancelot.six@amd.com> | 2022-08-02 13:14:20 +0100 |
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committer | Lancelot SIX <lancelot.six@amd.com> | 2022-08-03 09:57:40 +0100 |
commit | f74a5e6f2ed5180ce28d6478a6d7a7a1982c5d43 (patch) | |
tree | f6604c034273bc6a6222c7730dd3ae6361f0eef1 | |
parent | ecfc6ddb8074aff8882155b5900958725094f508 (diff) | |
download | gdb-f74a5e6f2ed5180ce28d6478a6d7a7a1982c5d43.zip gdb-f74a5e6f2ed5180ce28d6478a6d7a7a1982c5d43.tar.gz gdb-f74a5e6f2ed5180ce28d6478a6d7a7a1982c5d43.tar.bz2 |
gdb: Fix regression in varobj recreation
Commit bc20e562ec0 "Fix use after free in varobj" introduced a
regression. This commit makes sure that the varobj object does not
keeps stale references to object being freed when we unload an objfile.
This includes the "valid_block" field which is reset to nullptr if the
pointed to block is tied to an objfile being freed.
However, at some point varobj_invalidate_iter might try to recreate
varobjs tracking either floating or globals. Varobj tracking globals
are identified as having the "valid_block" field set nullptr, but as
bc20e562ec0 might clear this field, we have lost the ability to
distinguish between varobj referring to globals and non globals.
Fix this by introducing a "global" flag which tracks if a given varobj
was initially created as tracking a global.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29426
-rw-r--r-- | gdb/varobj.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/gdb/varobj.c b/gdb/varobj.c index e558794..0683af1 100644 --- a/gdb/varobj.c +++ b/gdb/varobj.c @@ -102,6 +102,9 @@ struct varobj_root to symbols that do not exist anymore. */ bool is_valid = true; + /* Set to true if the varobj was created as tracking a global. */ + bool global = false; + /* Language-related operations for this variable and its children. */ const struct lang_varobj_ops *lang_ops = NULL; @@ -336,6 +339,8 @@ varobj_create (const char *objname, var->format = variable_default_display (var.get ()); var->root->valid_block = var->root->floating ? NULL : tracker.block (); + var->root->global + = var->root->floating ? false : var->root->valid_block == nullptr; var->name = expression; /* For a root var, the name and the expr are the same. */ var->path_expr = expression; @@ -2359,7 +2364,7 @@ static void varobj_invalidate_iter (struct varobj *var) { /* global and floating var must be re-evaluated. */ - if (var->root->floating || var->root->valid_block == nullptr) + if (var->root->floating || var->root->global) { struct varobj *tmp_var; @@ -2375,7 +2380,7 @@ varobj_invalidate_iter (struct varobj *var) varobj_delete (var, 0); install_variable (tmp_var); } - else if (!var->root->floating) + else if (var->root->global) { /* Only invalidate globals as floating vars might still be valid in some other frame. */ |