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iommu: apple-dart: fix potential null pointer deref

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If kzalloc() fails, accessing cfg->supports_bypass causes a null pointer dereference.

Fix by checking for NULL immediately after allocation and returning -ENOMEM.

Fixes: 3bc0102835 ("iommu: apple-dart: Allow mismatched bypass support")
Signed-off-by: Qasim Ijaz <qasdev00@gmail.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Link: https://lore.kernel.org/r/20250314230102.11008-1-qasdev00@gmail.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Qasim Ijaz 2025-03-14 23:01:02 +00:00 committed by Joerg Roedel
parent 3bc0102835
commit b8741496c0
1 changed files with 2 additions and 3 deletions
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5
drivers/iommu/apple-dart.c
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@ -797,12 +797,11 @@ static int apple_dart_of_xlate(struct device *dev,
if (!cfg) {
cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
if (!cfg)
return -ENOMEM;
/* Will be ANDed with DART capabilities */
cfg->supports_bypass = true;
}
if (!cfg)
return -ENOMEM;
dev_iommu_priv_set(dev, cfg);
cfg_dart = cfg->stream_maps[0].dart;