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authorEric Sesterhenn <snakebyte@gmx.de>2008-10-18 20:28:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-20 08:52:38 -0700
commit248736c2a57206388c86f8cdd3392ee986e84f9f (patch)
tree1097d53f082e6773d7ecaac2eea5f7825c62cb01 /fs/hfsplus/extents.c
parent6e7152944426be786c6c232990914e4565290d35 (diff)
downloadlinux-248736c2a57206388c86f8cdd3392ee986e84f9f.tar.bz2
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>
Diffstat (limited to 'fs/hfsplus/extents.c')
-rw-r--r--fs/hfsplus/extents.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/hfsplus/extents.c b/fs/hfsplus/extents.c
index fec8f61227ff..0022eec63cda 100644
--- a/fs/hfsplus/extents.c
+++ b/fs/hfsplus/extents.c
@@ -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) {