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| author |   Curt Wohlgemuth <curtw@google.com> | 2011-10-26 04:38:59 -0400 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2011-10-26 04:38:59 -0400 |
| commit | 6f8ff537266ee5396c920fb0c842a21df3055ff3 (patch) | |
| tree | a024979a4e8f718289e9bf36fc165b96b68d6209 /fs/ext4/inode.c | |
| parent | ext4: error handling fix in ext4_ext_convert_to_initialized() (diff) | |
| download | linux-dev-6f8ff537266ee5396c920fb0c842a21df3055ff3.tar.xz linux-dev-6f8ff537266ee5396c920fb0c842a21df3055ff3.zip | |
ext4: handle NULL p_ext in ext4_ext_next_allocated_block()
In ext4_ext_next_allocated_block(), the path[depth] might
have a p_ext that is NULL -- see ext4_ext_binsearch(). In
such a case, dereferencing it will crash the machine.
This patch checks for p_ext == NULL in
ext4_ext_next_allocated_block() before dereferencinging it.
Tested using a hand-crafted an inode with eh_entries == 0 in
an extent block, verified that running FIEMAP on it crashes
without this patch, works fine with it.
Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/inode.c')
0 files changed, 0 insertions, 0 deletions