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| author | Stuart Swales <stuart.swales.croftnuisk@gmail.com> | 2011-03-22 16:35:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-22 17:44:17 -0700 |
| commit | 2f09719af705db56032ae480a2d9c32c2a3fcbd3 (patch) | |
| tree | 20fc7dc5c6955a943e01e78cfcdf77d1ab3e6027 /fs/adfs/adfs.h | |
| parent | 12da58b0c89e27617aaedde7dcf99a8690875e91 (diff) | |
| download | linux-2f09719af705db56032ae480a2d9c32c2a3fcbd3.tar.gz linux-2f09719af705db56032ae480a2d9c32c2a3fcbd3.tar.bz2 linux-2f09719af705db56032ae480a2d9c32c2a3fcbd3.zip | |
adfs: fix E+/F+ dir size > 2048 crashing kernel
Kernel crashes in fs/adfs module when accessing directories with a large
number of objects on mounted Acorn ADFS E+/F+ format discs (or images) as
the existing code writes off the end of the fixed array of struct
buffer_head pointers.
Additionally, each directory access that didn't crash would leak a buffer
as nr_buffers was not adjusted correctly for E+/F+ discs (was always left
as one less than required).
The patch fixes this by allocating a dynamically-sized set of struct
buffer_head pointers if necessary for the E+/F+ case (many directories
still do in fact fit in 2048 bytes) and sets the correct nr_buffers so
that all buffers are released.
Addresses https://bugzilla.kernel.org/show_bug.cgi?id=26072
Tested by tar'ing the contents of my RISC PC's E+ format 20Gb HDD which
contains a number of large directories that previously crashed the kernel.
Signed-off-by: Stuart Swales <stuart.swales.croftnuisk@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/adfs/adfs.h')
| -rw-r--r-- | fs/adfs/adfs.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/adfs/adfs.h b/fs/adfs/adfs.h index 2ff622f6f547..58588ddb178c 100644 --- a/fs/adfs/adfs.h +++ b/fs/adfs/adfs.h @@ -79,6 +79,10 @@ struct adfs_dir { int nr_buffers; struct buffer_head *bh[4]; + + /* big directories need allocated buffers */ + struct buffer_head **bh_fplus; + unsigned int pos; unsigned int parent_id; |