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hfsplus: fix possible deadlock when handling corrupted extents 

A corrupted extent for the extent file itself may try to get an impossible
extent, causing a deadlock if I see it correctly.

Check the inode number after the first_blocks checks and fail if it's the
extent file, as according to the spec the extent file should have no
extent for itself.

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Sesterhenn 2008-10-18 20:28:02 -07:00 committed by Linus Torvalds
parent 6e71529444
commit 248736c2a5
1 changed files with 3 additions and 0 deletions
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3
fs/hfsplus/extents.c
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@ -199,6 +199,9 @@ int hfsplus_get_block(struct inode *inode, sector_t iblock,
goto done;
}
if (inode->i_ino == HFSPLUS_EXT_CNID)
return -EIO;
mutex_lock(&HFSPLUS_I(inode).extents_lock);
res = hfsplus_ext_read_extent(inode, ablock);
if (!res) {