ASoC: cs-amp-lib: Prevent NULL pointer if efi variable is zero length

Browse source

In cs_amp_alloc_get_efi_variable() the first call to
cs_amp_get_efi_variable() might return EFI_SUCCESS if the variable
exists with zero length. Trap this and return -ENOENT to prevent
returning an unexpected NULL pointer.

The first cs_amp_get_efi_variable() call was assumed to return
EFI_BUFFER_TOO_SMALL if the variable existed, but if instead it
returned EFI_SUCCESS this would be converted to 0 by
cs_amp_convert_efi_status() and then be returned as a NULL pointer.

Fixes: 00fd40bc7a ("ASoC: cs-amp-lib: Support Dell SSIDExV2 UEFI variable")
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20260914122611.2783563-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

...

This commit is contained in:

Richard Fitzgerald 2026-09-14 13:26:11 +01:00 • committed by Mark Brown

parent 03a5699a0a

commit 3482062c78

No known key found for this signature in database

GPG key ID: 24D68B725D5487D0

1 changed files with 2 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

sound/soc/codecs/cs-amp-lib.c

View file