Messages in this thread | | | Date | Mon, 9 Nov 2020 17:23:31 +0000 | From | Mark Brown <> | Subject | Re: [PATCH] regmap: Properly free allocated name for regmap_config of syscon |
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On Mon, Nov 09, 2020 at 07:58:16PM +0800, Kefeng Wang wrote:
> syscon_config.name in of_syscon_register is allocated using kasprintf, > which should be freed when it is not used after regmap_set_name, fix > the following memory leak.
> unreferenced object 0xffffffe07fe8c150 (size 16): > comm "swapper/0", pid 1, jiffies 4294892540 (age 68.168s) > hex dump (first 16 bytes): > 74 65 73 74 40 31 30 30 30 30 30 00 e0 ff ff ff test@100000..... > backtrace: > [<0000000023d86736>] create_object+0xe8/0x348 > [<00000000fe9d1b17>] kmemleak_alloc+0x20/0x2a
Please think hard before including complete backtraces in upstream reports, they are very large and contain almost no useful information relative to their size so often obscure the relevant content in your message. If part of the backtrace is usefully illustrative (it often is for search engines if nothing else) then it's usually better to pull out the relevant sections.
> @@ -601,6 +601,7 @@ static int regmap_set_name(struct regmap *map, const struct regmap_config *confi > if (!name) > return -ENOMEM; > > + kfree_const(config->name); > kfree_const(map->name); > map->name = name; > }
Why would we free the passed in name here? The name wes passed in from outside regmap in a const configuration struct, we've no idea within regmap if it was dynamically allocted or not and it seems very surprising that we'd go off and free it. The whole reason we're duplicating it in regmap_set_name() is that we don't know how long it's going to be around so we don't want to reference it after having returned to the caller. If the caller has dynamically allocated it then the caller should deal with freeing it. [unhandled content-type:application/pgp-signature] | |