From 70bb08962ea9bd50797ae9f16b2493f5f7c65053 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Fri, 5 Sep 2008 14:00:24 -0700 Subject: [PATCH] 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: Acked-by: Pierre Ossman Cc: [2.6.25.x, 2.6.26.x] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/mmc/card/block.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) 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; -- GitLab