This is a note to let you know that I've just added the patch titled
s390/dasd: fix error checks in dasd_copy_pair_store()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-dasd-fix-error-checks-in-dasd_copy_pair_store.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 588080dc71b3546ffab356540eb647d5b88b7616
Author: Carlos López <clopez@xxxxxxx>
Date: Mon Jul 15 13:24:34 2024 +0200
s390/dasd: fix error checks in dasd_copy_pair_store()
[ Upstream commit 8e64d2356cbc800b4cd0e3e614797f76bcf0cdb8 ]
dasd_add_busid() can return an error via ERR_PTR() if an allocation
fails. However, two callsites in dasd_copy_pair_store() do not check
the result, potentially resulting in a NULL pointer dereference. Fix
this by checking the result with IS_ERR() and returning the error up
the stack.
Fixes: a91ff09d39f9b ("s390/dasd: add copy pair setup")
Signed-off-by: Carlos López <clopez@xxxxxxx>
Signed-off-by: Stefan Haberland <sth@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240715112434.2111291-3-sth@xxxxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index 6f9f7a0723128..7447dec5ce221 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -2141,13 +2141,19 @@ static ssize_t dasd_copy_pair_store(struct device *dev,
/* allocate primary devmap if needed */
prim_devmap = dasd_find_busid(prim_busid);
- if (IS_ERR(prim_devmap))
+ if (IS_ERR(prim_devmap)) {
prim_devmap = dasd_add_busid(prim_busid, DASD_FEATURE_DEFAULT);
+ if (IS_ERR(prim_devmap))
+ return PTR_ERR(prim_devmap);
+ }
/* allocate secondary devmap if needed */
sec_devmap = dasd_find_busid(sec_busid);
- if (IS_ERR(sec_devmap))
+ if (IS_ERR(sec_devmap)) {
sec_devmap = dasd_add_busid(sec_busid, DASD_FEATURE_DEFAULT);
+ if (IS_ERR(sec_devmap))
+ return PTR_ERR(sec_devmap);
+ }
/* setting copy relation is only allowed for offline secondary */
if (sec_devmap->device)
