fs/ntfs3: Fix slab-out-of-bounds read in ntfs_trim_fs

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[ Upstream commit 557d19675a ]

Syzbot reports an out of bound access in ntfs_trim_fs.
The cause of this is using a loop termination condition that compares
window index (iw) with wnd->nbits instead of wnd->nwnd, due to which the
index used for wnd->free_bits exceeds the size of the array allocated.

Fix the loop condition.

Fixes: 3f3b442b5a ("fs/ntfs3: Add bitmap")
Link: https://syzkaller.appspot.com/bug?extid=b892240eac461e488d51
Reported-by: syzbot+b892240eac461e488d51@syzkaller.appspotmail.com
Signed-off-by: Abdun Nihaal <abdun.nihaal@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Abdun Nihaal 2022-10-01 12:30:24 +05:30 • committed by Greg Kroah-Hartman

parent cf66351484

commit f2e58e9527

1 changed files with 1 additions and 1 deletions

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fs/ntfs3/bitmap.c

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