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devlink: fix xa_alloc_cyclic() error handling

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In case of returning 1 from xa_alloc_cyclic() (wrapping) ERR_PTR(1) will
be returned, which will cause IS_ERR() to be false. Which can lead to
dereference not allocated pointer (rel).

Fix it by checking if err is lower than zero.

This wasn't found in real usecase, only noticed. Credit to Pierre.

Fixes: c137743bce02 ("devlink: introduce object and nested devlink relationship infra")
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Swiatkowski 2025-03-12 10:52:49 +01:00 committed by David S. Miller
parent 9a81fc3480
commit f3b97b7d4b
1 changed files with 1 additions and 1 deletions
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2
net/devlink/core.c
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@ -117,7 +117,7 @@ static struct devlink_rel *devlink_rel_alloc(void)
err = xa_alloc_cyclic(&devlink_rels, &rel->index, rel,
xa_limit_32b, &next, GFP_KERNEL);
if (err) {
if (err < 0) {
kfree(rel);
return ERR_PTR(err);
}