From: Christophe JAILLET christophe.jaillet@wanadoo.fr
stable inclusion from stable-v5.10.121 commit 6073af78156b8c3fc1198f8bcc190b7ac3ac0143 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6CQ
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit aab08c1aac01097815fbcf10fce7021d2396a31f ]
If a call to alloc_chrdev_region() fails, the already allocated resources are leaking.
Add the needed error handling path to fix the leak.
Fixes: 42d279f9137a ("dmaengine: idxd: add char driver to expose submission portal to userland") Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr Acked-by: Dave Jiang dave.jiang@intel.com Link: https://lore.kernel.org/r/1b5033dcc87b5f2a953c413f0306e883e6114542.165052159... Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com --- drivers/dma/idxd/cdev.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c index 4da88578ed64..ae65eb90afab 100644 --- a/drivers/dma/idxd/cdev.c +++ b/drivers/dma/idxd/cdev.c @@ -266,10 +266,16 @@ int idxd_cdev_register(void) rc = alloc_chrdev_region(&ictx[i].devt, 0, MINORMASK, ictx[i].name); if (rc) - return rc; + goto err_free_chrdev_region; }
return 0; + +err_free_chrdev_region: + for (i--; i >= 0; i--) + unregister_chrdev_region(ictx[i].devt, MINORMASK); + + return rc; }
void idxd_cdev_remove(void)