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new 61cabd62cb ff_mkdir_p: skip Windows drive letter to avoid spurious
EACCES
61cabd62cb is described below
commit 61cabd62cbf0d240620ef7caa382d665268e61b4
Author: Khalil Elemam <[email protected]>
AuthorDate: Wed Aug 26 07:38:01 2026 +0000
Commit: Daniel Verkamp <[email protected]>
CommitDate: Sat Sep 12 07:27:42 2026 +0000
ff_mkdir_p: skip Windows drive letter to avoid spurious EACCES
ff_mkdir_p walks the path and calls mkdir() on each prefix component,
including the bare drive letter (e.g. "C:"). On Windows, "C:" is a
drive-relative path that resolves to the process's saved current directory
on that drive. When the process CWD is on a different drive, "C:" resolves
to the drive root (C:\), and mkdir on the root returns EACCES.
This causes spurious "Permission denied" errors when creating output
directories (e.g. HLS segments) on a drive different from the process
working directory.
Fix: skip the drive letter (X:) and the following separator(s) before
the component walk, so the first mkdir targets an absolute path.
Fixes #24263
---
libavformat/utils.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/libavformat/utils.c b/libavformat/utils.c
index dabd958397..4874a825a0 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -436,6 +436,15 @@ int ff_mkdir_p(const char *path)
pos++;
} else if (!av_strncasecmp(temp, "./", 2) || !av_strncasecmp(temp, ".\\",
2)) {
pos += 2;
+ } else if (is_dos_path(temp)) {
+ /* Skip Windows drive letter (e.g. "C:") and the separator(s) after it.
+ * Otherwise the loop below calls mkdir("C:"), which on Windows is a
+ * drive-relative path. When the process CWD is on a different drive,
+ * "C:" resolves to the drive root (C:\), and mkdir on the root
+ * returns EACCES, causing spurious "Permission denied" errors. */
+ pos += 2;
+ while (*pos == '/' || *pos == '\\')
+ pos++;
}
for ( ; *pos != '\0'; ++pos) {
--
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