dm-verity: increase sprintf buffer size

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commit 88dd117c92 upstream.

The prefix "DM_VERITY_ERR_BLOCK_NR" is 22 chars. Add '=', one digit for
type, ',', up to 20 digits for a u64 block number, and a NUL terminator:
that's 46 bytes. The buffer is 42 bytes. For block numbers >= 16 decimal
digits (devices larger than ~16 EB with 4K blocks), snprintf silently
truncates the uevent environment variable.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Assisted-by: Claude:claude-opus-4.6
Fixes: 65ff5b7ddf ("dm verity: add error handling modes for corrupted blocks")
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Mikulas Patocka 2026-07-09 21:36:01 +02:00 • committed by Greg Kroah-Hartman

parent 72c3283a2a

commit 44bb09f0ca

1 changed files with 1 additions and 1 deletions

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drivers/md/dm-verity-target.c

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