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block/rnbd: fix a null pointer dereference on dev->blk_symlink_name

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[ Upstream commit 733c15bd3a944b8eeaacdddf061759b6a83dd3f4 ]

Currently in the case where dev->blk_symlink_name fails to be allocates
the error return path attempts to set an end-of-string character to
the unallocated dev->blk_symlink_name causing a null pointer dereference
error. Fix this by returning with an explicity ENOMEM error (which also
is missing in the original code as was not initialized).

Fixes: 1eb54f8f5dd8 ("block/rnbd: client: sysfs interface functions")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Addresses-Coverity: ("Dereference after null check")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Colin Ian King 2020-12-07 14:54:46 +00:00 committed by Greg Kroah-Hartman
parent a7d4dd109e
commit aa4f552aec
1 changed files with 1 additions and 1 deletions
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2
drivers/block/rnbd/rnbd-clt-sysfs.c
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@ -494,7 +494,7 @@ static int rnbd_clt_add_dev_symlink(struct rnbd_clt_dev *dev)
dev->blk_symlink_name = kzalloc(len, GFP_KERNEL);
if (!dev->blk_symlink_name) {
rnbd_clt_err(dev, "Failed to allocate memory for blk_symlink_name\n");
goto out_err;
return -ENOMEM;
}
ret = rnbd_clt_get_path_name(dev, dev->blk_symlink_name,