zram: reject zero-size dictionary

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kernel_read_file_from_path() already rejects empty files (i_size <= 0) and
returns -EINVAL, but the current implementation only checks for sz < 0
without logging any information.  Use sz == 0 to reject the zero-size case
and print distinct error messages for each failure type.

Link: https://lore.kernel.org/20260804093841.67920-3-haoqinhuang7@gmail.com
Signed-off-by: Haoqin Huang <haoqinhuang@tencent.com>
Signed-off-by: Rongwei Wang <zigiwang@tencent.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Tested-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: David Sterba <dsterba@suse.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nick Terrell <terrelln@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

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Haoqin Huang 2026-08-04 17:38:38 +08:00 • committed by Andrew Morton

parent 45214458d6

commit 6dc404d433

1 changed files with 9 additions and 1 deletions

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drivers/block/zram/zram_drv.c

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