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commit88dd117c92upstream. 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>