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fs/ntfs3: Fix memory corruption when page_size changes

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The rework in fs/ntfs3: Reduce stack usage
changes log->page_size but doesn't change the associated
log->page_mask and log->page_bits.

That results in the bytes value in read_log_page
getting a negative value, which is bad when it is
passed to memcpy.

The kernel panic can be observed when connecting an
ntfs formatted drive that has previously been connected
to a Windows machine to a Raspberry Pi 5, which by defauilt
uses a 16K kernel pagesize.

Fixes: 865e7a7700 ("fs/ntfs3: Reduce stack usage")
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
This commit is contained in:
Dom Cobley
2024-06-11 16:12:47 +01:00
parent d7aece5664
commit 150b75e012
1 changed files with 2 additions and 0 deletions
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2
fs/ntfs3/fslog.c
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@@ -3914,6 +3914,8 @@ check_restart_area:
log->l_size = log->orig_file_size;
log->page_size = norm_file_page(t32, &log->l_size,
t32 == DefaultLogPageSize);
log->page_mask = log->page_size - 1;
log->page_bits = blksize_bits(log->page_size);
}
if (log->page_size != t32 ||