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authorBart Van Assche <bvanassche@acm.org>2019-10-09 19:35:36 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2019-10-10 05:39:35 +0200
commit6a0990eaa768dfb7064f06777743acc6d392084b (patch)
tree2c3037db02d2d00da8ca9f7bb8797a171cf68b1b /drivers/rtc
parentscsi: fix kconfig dependency warning related to 53C700_LE_ON_BE (diff)
downloadlinux-6a0990eaa768dfb7064f06777743acc6d392084b.tar.xz
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scsi: ch: Make it possible to open a ch device multiple times again
Clearing ch->device in ch_release() is wrong because that pointer must remain valid until ch_remove() is called. This patch fixes the following crash the second time a ch device is opened: BUG: kernel NULL pointer dereference, address: 0000000000000790 RIP: 0010:scsi_device_get+0x5/0x60 Call Trace: ch_open+0x4c/0xa0 [ch] chrdev_open+0xa2/0x1c0 do_dentry_open+0x13a/0x380 path_openat+0x591/0x1470 do_filp_open+0x91/0x100 do_sys_open+0x184/0x220 do_syscall_64+0x5f/0x1a0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes: 085e56766f74 ("scsi: ch: add refcounting") Cc: Hannes Reinecke <hare@suse.de> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20191009173536.247889-1-bvanassche@acm.org Reported-by: Rob Turk <robtu@rtist.nl> Suggested-by: Rob Turk <robtu@rtist.nl> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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