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regmap: fix NULL deref on lookup 

commit c6df843348 upstream.

Not all regmaps have a name so make sure to check for that to avoid
dereferencing a NULL pointer when dev_get_regmap() is used to lookup a
named regmap.

Fixes: e84861fec3 ("regmap: dev_get_regmap_match(): fix string comparison")
Cc: stable@vger.kernel.org      # 5.8
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20231006082104.16707-1-johan+linaro@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2023-10-06 10:21:04 +02:00 committed by Greg Kroah-Hartman
parent c95fa5b20f
commit 4cbac83549
1 changed files with 1 additions and 1 deletions
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2
drivers/base/regmap/regmap.c
View File

@ -1511,7 +1511,7 @@ static int dev_get_regmap_match(struct device *dev, void *res, void *data)
/* If the user didn't specify a name match any */
if (data)
return !strcmp((*r)->name, data);
return (*r)->name && !strcmp((*r)->name, data);
else
return 1;
}