fs/minix: Verify bitmap block counts before mounting

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Newer versions of MINIX can create filesystems that allocate an extra
bitmap block.  Mounting of this succeeds, but doing a statfs call will
result in an oops in count_free because of a negative number being used
for the bh index.

Avoid this by verifying the number of allocated blocks at mount time,
erroring out if there are not enough and make statfs ignore the extras
if there are too many.

This fixes https://bugzilla.kernel.org/show_bug.cgi?id=18792

Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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This commit is contained in:

Josh Boyer 2011-08-19 14:50:26 -04:00 • committed by Al Viro

parent d633180c20

commit 016e8d44bc

3 changed files with 42 additions and 10 deletions

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18

fs/minix/bitmap.c

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25

fs/minix/inode.c

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9

fs/minix/minix.h

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