diff options
| author | Andrew Morton <akpm@linux-foundation.org> | 2008-09-06 01:00:24 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-09-06 01:39:38 +0400 |
| commit | 70bb08962ea9bd50797ae9f16b2493f5f7c65053 (patch) | |
| tree | 301692bce950f064633b80a93cbb808bead41351 /drivers/mmc/card/block.c | |
| parent | 22f30168d296dbb54a21ebad44c9d735bca6f67b (diff) | |
| download | linux-70bb08962ea9bd50797ae9f16b2493f5f7c65053.tar.xz | |
drivers/mmc/card/block.c: fix refcount leak in mmc_block_open()
mmc_block_open() increments md->usage although it returns with -EROFS when
default mounting a MMC/SD card with write protect switch on. This
reference counting bug prevents /dev/mmcblkX from being released on card
removal, and situation worsen with reinsertion until the minor number
range runs out.
Reported-by: <sasin@solomon-systech.com>
Acked-by: Pierre Ossman <drzeus-list@drzeus.cx>
Cc: <stable@kernel.org> [2.6.25.x, 2.6.26.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mmc/card/block.c')
| -rw-r--r-- | drivers/mmc/card/block.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 86dbb366415a..6986f3926244 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -103,8 +103,10 @@ static int mmc_blk_open(struct inode *inode, struct file *filp) check_disk_change(inode->i_bdev); ret = 0; - if ((filp->f_mode & FMODE_WRITE) && md->read_only) + if ((filp->f_mode & FMODE_WRITE) && md->read_only) { + mmc_blk_put(md); ret = -EROFS; + } } return ret; |