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[PATCH] md: define and use safe_put_page for md 

md sometimes call put_page on NULL pointers (treating it like kfree).  This is
not safe, so define and use a 'safe_put_page' which checks for NULL.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-01-06 00:20:40 -08:00 committed by Linus Torvalds
parent 7dd5d34c6c
commit 1345b1d8ad
5 changed files with 15 additions and 12 deletions
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3
drivers/md/bitmap.c
View File

@ -626,8 +626,7 @@ static void bitmap_file_unmap(struct bitmap *bitmap)
kfree(map);
kfree(attr);
if (sb_page)
put_page(sb_page);
safe_put_page(sb_page);
}
static void bitmap_stop_daemon(struct bitmap *bitmap);

8
drivers/md/raid1.c
View File

@ -136,7 +136,7 @@ static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data)
out_free_pages:
for (i=0; i < RESYNC_PAGES ; i++)
for (j=0 ; j < pi->raid_disks; j++)
put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page);
safe_put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page);
j = -1;
out_free_bio:
while ( ++j < pi->raid_disks )
@ -156,7 +156,7 @@ static void r1buf_pool_free(void *__r1_bio, void *data)
if (j == 0 ||
r1bio->bios[j]->bi_io_vec[i].bv_page !=
r1bio->bios[0]->bi_io_vec[i].bv_page)
put_page(r1bio->bios[j]->bi_io_vec[i].bv_page);
safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page);
}
for (i=0 ; i < pi->raid_disks; i++)
bio_put(r1bio->bios[i]);
@ -381,7 +381,7 @@ static int raid1_end_write_request(struct bio *bio, unsigned int bytes_done, int
/* free extra copy of the data pages */
int i = bio->bi_vcnt;
while (i--)
put_page(bio->bi_io_vec[i].bv_page);
safe_put_page(bio->bi_io_vec[i].bv_page);
}
/* clear the bitmap if all writes complete successfully */
bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector,
@ -1907,7 +1907,7 @@ out_free_conf:
if (conf->r1bio_pool)
mempool_destroy(conf->r1bio_pool);
kfree(conf->mirrors);
put_page(conf->tmppage);
safe_put_page(conf->tmppage);
kfree(conf->poolinfo);
kfree(conf);
mddev->private = NULL;

8
drivers/md/raid10.c
View File

@ -132,10 +132,10 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data)
out_free_pages:
for ( ; i > 0 ; i--)
put_page(bio->bi_io_vec[i-1].bv_page);
safe_put_page(bio->bi_io_vec[i-1].bv_page);
while (j--)
for (i = 0; i < RESYNC_PAGES ; i++)
put_page(r10_bio->devs[j].bio->bi_io_vec[i].bv_page);
safe_put_page(r10_bio->devs[j].bio->bi_io_vec[i].bv_page);
j = -1;
out_free_bio:
while ( ++j < nalloc )
@ -155,7 +155,7 @@ static void r10buf_pool_free(void *__r10_bio, void *data)
struct bio *bio = r10bio->devs[j].bio;
if (bio) {
for (i = 0; i < RESYNC_PAGES; i++) {
put_page(bio->bi_io_vec[i].bv_page);
safe_put_page(bio->bi_io_vec[i].bv_page);
bio->bi_io_vec[i].bv_page = NULL;
}
bio_put(bio);
@ -2042,7 +2042,7 @@ static int run(mddev_t *mddev)
out_free_conf:
if (conf->r10bio_pool)
mempool_destroy(conf->r10bio_pool);
put_page(conf->tmppage);
safe_put_page(conf->tmppage);
kfree(conf->mirrors);
kfree(conf);
mddev->private = NULL;

3
drivers/md/raid6main.c
View File

@ -2072,8 +2072,7 @@ static int run(mddev_t *mddev)
abort:
if (conf) {
print_raid6_conf(conf);
if (conf->spare_page)
put_page(conf->spare_page);
safe_put_page(conf->spare_page);
kfree(conf->stripe_hashtbl);
kfree(conf);
}

5
include/linux/raid/md_k.h
View File

@ -324,5 +324,10 @@ do { \
__wait_event_lock_irq(wq, condition, lock, cmd); \
} while (0)
static inline void safe_put_page(struct page *p)
{
if (p) put_page(p);
}
#endif