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PM: hibernate: Use atomic64_t for compressed_size variable

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commit 66ededc694 upstream.

`compressed_size` can overflow, showing nonsensical values.

Change from `atomic_t` to `atomic64_t` to prevent overflow.

Fixes: a06c6f5d3c ("PM: hibernate: Move to crypto APIs for LZO compression")
Reported-by: Askar Safin <safinaskar@gmail.com>
Closes: https://lore.kernel.org/linux-pm/20251105180506.137448-1-safinaskar@gmail.com/
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Tested-by: Askar Safin <safinaskar@gmail.com>
Cc: 6.9+ <stable@vger.kernel.org> # 6.9+
Link: https://patch.msgid.link/20251106045158.3198061-3-superm1@kernel.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mario Limonciello (AMD)
2025-11-05 22:51:06 -06:00
committed by Greg Kroah-Hartman
parent 692101646f
commit ee80ff1f10
1 changed files with 5 additions and 5 deletions
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10
kernel/power/swap.c
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@@ -635,7 +635,7 @@ struct cmp_data {
};
/* Indicates the image size after compression */
static atomic_t compressed_size = ATOMIC_INIT(0);
static atomic64_t compressed_size = ATOMIC_INIT(0);
/*
* Compression function that runs in its own thread.
@@ -664,7 +664,7 @@ static int compress_threadfn(void *data)
d->ret = crypto_acomp_compress(d->cr);
d->cmp_len = d->cr->dlen;
atomic_set(&compressed_size, atomic_read(&compressed_size) + d->cmp_len);
atomic64_add(d->cmp_len, &compressed_size);
atomic_set_release(&d->stop, 1);
wake_up(&d->done);
}
@@ -696,7 +696,7 @@ static int save_compressed_image(struct swap_map_handle *handle,
hib_init_batch(&hb);
atomic_set(&compressed_size, 0);
atomic64_set(&compressed_size, 0);
/*
* We'll limit the number of threads for compression to limit memory
@@ -879,8 +879,8 @@ out_finish:
ret = err2;
if (!ret) {
swsusp_show_speed(start, stop, nr_to_write, "Wrote");
pr_info("Image size after compression: %d kbytes\n",
(atomic_read(&compressed_size) / 1024));
pr_info("Image size after compression: %lld kbytes\n",
(atomic64_read(&compressed_size) / 1024));
pr_info("Image saving done\n");
} else {
pr_err("Image saving failed: %d\n", ret);