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mm/damon/sysfs: check error from damon_sysfs_update_target()

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commit b4936b544b upstream.

Patch series "mm/damon/sysfs: fix unhandled return values".

Some of DAMON sysfs interface code is not handling return values from some
functions.  As a result, confusing user input handling or NULL-dereference
is possible.  Check those properly.


This patch (of 3):

damon_sysfs_update_target() returns error code for failures, but its
caller, damon_sysfs_set_targets() is ignoring that.  The update function
seems making no critical change in case of such failures, but the behavior
will look like DAMON sysfs is silently ignoring or only partially
accepting the user input.  Fix it.

Link: https://lkml.kernel.org/r/20231106233408.51159-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20231106233408.51159-2-sj@kernel.org
Fixes: 19467a950b ("mm/damon/sysfs: remove requested targets when online-commit inputs")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>	[5.19+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
SeongJae Park 2023-11-06 23:34:06 +00:00 committed by Greg Kroah-Hartman
parent 2e4dec8e1b
commit d8cd49ff1f
1 changed files with 3 additions and 1 deletions
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4
mm/damon/sysfs.c
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@ -1197,8 +1197,10 @@ static int damon_sysfs_set_targets(struct damon_ctx *ctx,
damon_for_each_target_safe(t, next, ctx) {
if (i < sysfs_targets->nr) {
damon_sysfs_update_target(t, ctx,
err = damon_sysfs_update_target(t, ctx,
sysfs_targets->targets_arr[i]);
if (err)
return err;
} else {
if (damon_target_has_pid(ctx))
put_pid(t->pid);