bna: ensure the copied buf is NUL terminated

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[ Upstream commit 8c34096c7f ]

Currently, we allocate a nbytes-sized kernel buffer and copy nbytes from
userspace to that buffer. Later, we use sscanf on this buffer but we don't
ensure that the string is terminated inside the buffer, this can lead to
OOB read when using sscanf. Fix this issue by using memdup_user_nul
instead of memdup_user.

Fixes: 7afc5dbde0 ("bna: Add debugfs interface.")
Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
Link: https://lore.kernel.org/r/20240424-fix-oob-read-v2-2-f1f1b53a10f4@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Bui Quang Minh 2024-04-24 21:44:19 +07:00 • committed by Greg Kroah-Hartman

parent 272bfb019f

commit 06cb37e2ba

1 changed files with 2 additions and 2 deletions

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drivers/net/ethernet/brocade/bna/bnad_debugfs.c

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