ovl: reject lowerdir ending with unescaped backslash

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In ovl_parse_param_split_lowerdirs() a backslash consumes the
character that follows it.  When the backslash is the last character
of the lowerdir value, it consumes the NUL terminator: the loop exits
normally and the backslash is kept in the output, so the lowerdir is
passed downstream with a trailing backslash and the mount fails later
with a confusing ENOENT from path lookup.

A trailing unescaped backslash escapes nothing, so reject it with
EINVAL.

Signed-off-by: Guanglei Zhu <zhugl3@xiaopeng.com>
Link: https://patch.msgid.link/20261012095538.938789-1-zhugl3@xiaopeng.com
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

...

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Guanglei Zhu 2026-10-12 17:55:38 +08:00 • committed by Christian Brauner

parent 36ebddca56

commit 99ae7dc439

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fs/overlayfs/params.c

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