[binutils-gdb] ld: fix segfault when linker script is not found

[Matthieu Longo]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=f04c774b7d49912cc9dcb0cd613e819edb21c3a2

commit f04c774b7d49912cc9dcb0cd613e819edb21c3a2
Author: Matthieu Longo <matthieu.longo@arm.com>
Date:   Thu Sep 4 15:25:21 2025 +0100

    ld: fix segfault when linker script is not found
    
    ld previously crashed with a segmentation fault if the specified linker
    script could not be found. The issue seems to have been introduced
    recently by d048eee2910 [1].
    
    This patch adds a check to ensure that a filename was found after
    searching the possible prefixes. If no filename was found, the function
    returns NULL, and ldfile_open_command_file_1() emits a proper fatal
    error message.
    This change prevents the crash and provides a clear diagnostic.
    
    A new generic test was also added to cover this error case.
    
    [1]: https://inbox.sourceware.org/binutils/20250812143757.3565482-1-hjl
         .tools@gmail.com/

Diff:
---
 ld/ldfile.c                                       | 3 +++
 ld/testsuite/ld-scripts/linker-script-not-found.d | 3 +++
 ld/testsuite/ld-scripts/script.exp                | 1 +
 3 files changed, 7 insertions(+)

diff --git a/ld/ldfile.c b/ld/ldfile.c
index bed04fbf9eb..83591fe21db 100644
--- a/ld/ldfile.c
+++ b/ld/ldfile.c
@@ -877,6 +877,9 @@ ldfile_find_command_file (const char *name,
   /* Restore the original path list.  */
   *search_tail_ptr = NULL;
 
+  if (!filename)
+    return NULL;
+
  success:
   /* PR 24576: Catch the case where the user has accidentally included
      the same linker script twice.  */
diff --git a/ld/testsuite/ld-scripts/linker-script-not-found.d b/ld/testsuite/ld-scripts/linker-script-not-found.d
new file mode 100644
index 00000000000..61d4d8aa57d
--- /dev/null
+++ b/ld/testsuite/ld-scripts/linker-script-not-found.d
@@ -0,0 +1,3 @@
+#source: default-script.s
+#ld: -T misspelled.ld
+#error: cannot open linker script file misspelled\.ld: .*\Z
diff --git a/ld/testsuite/ld-scripts/script.exp b/ld/testsuite/ld-scripts/script.exp
index 40bfe1a56e5..7a23f435121 100644
--- a/ld/testsuite/ld-scripts/script.exp
+++ b/ld/testsuite/ld-scripts/script.exp
@@ -235,6 +235,7 @@ run_dump_test "ld-version"
 run_dump_test "ld-version-2"
 run_dump_test "pr24576-1"
 run_dump_test "pr24576-2"
+run_dump_test "linker-script-not-found"
 
 run_dump_test "segment-start" {{name (default)}}
 run_dump_test "segment-start" {{name (overridden)} \