Fuzzer generates an image with crafted chunks of some invalid device. Also refine the printed message of EOD.
Closes: https://github.com/erofs/erofsnightly/actions/runs/10172576269/job/28135408276 Closes: https://github.com/erofs/erofs-utils/issues/11 Signed-off-by: Gao Xiang <hsiang...@linux.alibaba.com> --- lib/io.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/lib/io.c b/lib/io.c index 6bfae69..fbeff03 100644 --- a/lib/io.c +++ b/lib/io.c @@ -342,6 +342,10 @@ ssize_t erofs_dev_read(struct erofs_sb_info *sbi, int device_id, ssize_t read; if (device_id) { + if (device_id >= sbi->nblobs) { + erofs_err("invalid device id %u", device_id); + return -EIO; + } read = erofs_io_pread(&((struct erofs_vfile) { .fd = sbi->blobfd[device_id - 1], }), buf, offset, len); @@ -352,7 +356,8 @@ ssize_t erofs_dev_read(struct erofs_sb_info *sbi, int device_id, if (read < 0) return read; if (read < len) { - erofs_info("reach EOF of device, pading with zeroes"); + erofs_info("reach EOF of device @ %llu, pading with zeroes", + offset | 0ULL); memset(buf + read, 0, len - read); } return 0; -- 2.43.5
