fs: fix undefined behavior in bit shift for SB_NOUSER

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commit f15afbd34d upstream.

Shifting signed 32-bit value by 31 bits is undefined, so changing
significant bit to unsigned. It was spotted by UBSAN.

So let's just fix this by using the BIT() helper for all SB_* flags.

Fixes: e462ec50cb ("VFS: Differentiate mount flags (MS_*) from internal superblock flags")
Signed-off-by: Hao Ge <gehao@kylinos.cn>
Message-Id: <20230424051835.374204-1-gehao@kylinos.cn>
[brauner@kernel.org: use BIT() for all SB_* flags]
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Hao Ge 2023-04-24 13:18:35 +08:00 • committed by Greg Kroah-Hartman

parent dfc5aaa57f

commit ccc6e9ded6

1 changed files with 21 additions and 21 deletions

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include/linux/fs.h

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