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author | Konstantin Khlebnikov <koct9i@gmail.com> | 2016-03-17 14:22:08 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-17 15:09:34 -0700 |
commit | 2d6f45b802af7a15a0e455bcfad4009aa5e7b66b (patch) | |
tree | 168ed52e0dd19c10b2178015f66fe2e877e44f19 /tools/testing/radix-tree/regression3.c | |
parent | 7165092fe5ca70bae722ac6cd78421cfd0eec18d (diff) | |
download | op-kernel-dev-2d6f45b802af7a15a0e455bcfad4009aa5e7b66b.zip op-kernel-dev-2d6f45b802af7a15a0e455bcfad4009aa5e7b66b.tar.gz |
radix-tree tests: add regression3 test
After calling radix_tree_iter_retry(), 'slot' will be set to NULL. This
can cause radix_tree_next_slot() to dereference the NULL pointer. Add
Konstantin Khlebnikov's test to the regression framework.
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Reported-by: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/testing/radix-tree/regression3.c')
-rw-r--r-- | tools/testing/radix-tree/regression3.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/tools/testing/radix-tree/regression3.c b/tools/testing/radix-tree/regression3.c new file mode 100644 index 0000000..17d3ba5 --- /dev/null +++ b/tools/testing/radix-tree/regression3.c @@ -0,0 +1,86 @@ +/* + * Regression3 + * Description: + * Helper radix_tree_iter_retry resets next_index to the current index. + * In following radix_tree_next_slot current chunk size becomes zero. + * This isn't checked and it tries to dereference null pointer in slot. + * + * Running: + * This test should run to completion immediately. The above bug would + * cause it to segfault. + * + * Upstream commit: + * Not yet + */ +#include <linux/kernel.h> +#include <linux/gfp.h> +#include <linux/slab.h> +#include <linux/radix-tree.h> +#include <stdlib.h> +#include <stdio.h> + +#include "regression.h" + +void regression3_test(void) +{ + RADIX_TREE(root, GFP_KERNEL); + void *ptr = (void *)4ul; + struct radix_tree_iter iter; + void **slot; + bool first; + + printf("running regression test 3 (should take milliseconds)\n"); + + radix_tree_insert(&root, 0, ptr); + radix_tree_tag_set(&root, 0, 0); + + first = true; + radix_tree_for_each_tagged(slot, &root, &iter, 0, 0) { +// printk("tagged %ld %p\n", iter.index, *slot); + if (first) { + radix_tree_insert(&root, 1, ptr); + radix_tree_tag_set(&root, 1, 0); + first = false; + } + if (radix_tree_deref_retry(*slot)) { +// printk("retry %ld\n", iter.index); + slot = radix_tree_iter_retry(&iter); + continue; + } + } + radix_tree_delete(&root, 1); + + first = true; + radix_tree_for_each_slot(slot, &root, &iter, 0) { +// printk("slot %ld %p\n", iter.index, *slot); + if (first) { + radix_tree_insert(&root, 1, ptr); + first = false; + } + if (radix_tree_deref_retry(*slot)) { +// printk("retry %ld\n", iter.index); + slot = radix_tree_iter_retry(&iter); + continue; + } + } + radix_tree_delete(&root, 1); + + first = true; + radix_tree_for_each_contig(slot, &root, &iter, 0) { +// printk("contig %ld %p\n", iter.index, *slot); + if (first) { + radix_tree_insert(&root, 1, ptr); + first = false; + } + if (radix_tree_deref_retry(*slot)) { +// printk("retry %ld\n", iter.index); + slot = radix_tree_iter_retry(&iter); + continue; + } + } + + radix_tree_delete(&root, 0); + radix_tree_delete(&root, 1); + + printf("regression test 3 passed\n"); +} |