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| author |   Theodore Ts'o <tytso@mit.edu> | 2010-05-16 23:00:00 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-05-16 23:00:00 -0400 |
| commit | f70f362b4a6fe47c239dbfb3efc0cc2c10e4f09c (patch) | |
| tree | b9db08f3675d1cc0ed7d1af08418f5f5ba554ca6 /fs/jbd/commit.c | |
| parent | ext4: Use bitops to read/modify i_flags in struct ext4_inode_info (diff) | |
| download | linux-dev-f70f362b4a6fe47c239dbfb3efc0cc2c10e4f09c.tar.xz linux-dev-f70f362b4a6fe47c239dbfb3efc0cc2c10e4f09c.zip | |
ext4: Avoid crashing on NULL ptr dereference on a filesystem error
If the EOFBLOCK_FL flag is set when it should not be and the inode is
zero length, then eh_entries is zero, and ex is NULL, so dereferencing
ex to print ex->ee_block causes a kernel OOPS in
ext4_ext_map_blocks().
On top of that, the error message which is printed isn't very helpful.
So we fix this by printing something more explanatory which doesn't
involve trying to print ex->ee_block.
Addresses-Google-Bug: #2655740
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd/commit.c')
0 files changed, 0 insertions, 0 deletions