Due to being converted to a mbcs, the output of converting a wide string
of MAX_PATH characters is potentially larger than MAX_PATH bytes. The
DL_info::dli_fname member is actually PATH_MAX bytes, so specify that
(larger) size to cygwin_conv_path rather than PATH_MAX.
Fixes: c8432a01c840 ("Implement dladdr() (partially)")
Addresses:
https://github.com/rust-lang/backtrace-rs/pull/704#issuecomment-2833782574
Signed-off-by: Jeremy Drake <cyg...@jdrake.com>
---
Would it be better to use tmp_pathbuf in place of the fname WCHAR array,
to allow longer paths to come out of GetModuleFileNameW?
winsup/cygwin/dlfcn.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/winsup/cygwin/dlfcn.cc b/winsup/cygwin/dlfcn.cc
index 10bd0ac1f4..a3523b6153 100644
--- a/winsup/cygwin/dlfcn.cc
+++ b/winsup/cygwin/dlfcn.cc
@@ -428,7 +428,7 @@ dladdr (const void *addr, Dl_info *info)
/* Convert to a cygwin pathname */
ssize_t conv = cygwin_conv_path (CCP_WIN_W_TO_POSIX | CCP_ABSOLUTE, fname,
- info->dli_fname, MAX_PATH);
+ info->dli_fname, PATH_MAX);
if (conv)
return 0;
--
2.49.0.windows.1
