From: Florin Coras Date: Fri, 17 Apr 2020 20:15:22 +0000 (+0000) Subject: svm: check if fifo free list index is valid on alloc X-Git-Tag: v20.09-rc0~181 X-Git-Url: https://gerrit.fd.io/r/gitweb?p=vpp.git;a=commitdiff_plain;h=0e6199dfa20d4c010bf3ac43e051f9f29c213478 svm: check if fifo free list index is valid on alloc Type: fix Signed-off-by: Florin Coras Signed-off-by: Benoît Ganne Change-Id: Ib85c2f01dc7ec9858f2f88b89e209f989d78c5d9 --- diff --git a/src/plugins/unittest/svm_fifo_test.c b/src/plugins/unittest/svm_fifo_test.c index 242709cc608..87b85da8951 100644 --- a/src/plugins/unittest/svm_fifo_test.c +++ b/src/plugins/unittest/svm_fifo_test.c @@ -2127,9 +2127,9 @@ sfifo_test_fifo_segment_fifo_grow (int verbose) fifo_segment_main_t *sm = &segment_main; fifo_segment_create_args_t _a, *a = &_a; u8 *test_data = 0, *data_buf = 0; - u32 n_free_chunk_bytes; + u32 n_free_chunk_bytes, new_size; fifo_segment_t *fs; - svm_fifo_t *f; + svm_fifo_t *f, *tf; clib_memset (a, 0, sizeof (*a)); a->segment_name = "fifo-test1"; @@ -2298,12 +2298,20 @@ sfifo_test_fifo_segment_fifo_grow (int verbose) n_free_chunk_bytes, rv); /* - * Allocate fifo that has all chunks + * Allocate fifo that has all chunks. Because we have a chunk size limit of + * segment_size / 2, allocate 2 fifos. */ - f = fifo_segment_alloc_fifo (fs, n_free_chunk_bytes, FIFO_SEGMENT_RX_FIFO); + tf = fifo_segment_alloc_fifo (fs, n_free_chunk_bytes / 2, + FIFO_SEGMENT_RX_FIFO); + SFIFO_TEST (tf != 0, "allocation should work"); + SFIFO_TEST (svm_fifo_is_sane (tf), "fifo should be sane"); + + f = fifo_segment_alloc_fifo (fs, n_free_chunk_bytes / 2, + FIFO_SEGMENT_RX_FIFO); SFIFO_TEST (f != 0, "allocation should work"); SFIFO_TEST (svm_fifo_is_sane (f), "fifo should be sane"); + fifo_segment_free_fifo (fs, tf); fifo_segment_free_fifo (fs, f); rv = fifo_segment_fl_chunk_bytes (fs); @@ -2325,12 +2333,13 @@ sfifo_test_fifo_segment_fifo_grow (int verbose) FIFO_SEGMENT_RX_FIFO); /* Try to force fifo growth */ - svm_fifo_set_size (f, svm_fifo_size (f) + n_free_chunk_bytes + 1); - validate_test_and_buf_vecs (&test_data, &data_buf, svm_fifo_size (f)); - rv = svm_fifo_enqueue (f, svm_fifo_size (f), test_data); + new_size = svm_fifo_size (f) + n_free_chunk_bytes + 1; + svm_fifo_set_size (f, new_size); + validate_test_and_buf_vecs (&test_data, &data_buf, new_size); + rv = svm_fifo_enqueue (f, new_size, test_data); - SFIFO_TEST (rv != svm_fifo_size (f), "grow should fail size %u wrote %d", - svm_fifo_size (f), rv); + SFIFO_TEST (rv != new_size, "grow should fail size %u wrote %d", + new_size, rv); fifo_segment_free_fifo (fs, f); @@ -2514,7 +2523,7 @@ sfifo_test_fifo_segment_prealloc (int verbose) fifo_segment_create_args_t _a, *a = &_a; fifo_segment_main_t *sm = &segment_main; u32 max_pairs, pairs_req, free_space, pair_mem; - svm_fifo_t *f, *old; + svm_fifo_t *f, *tf, *old; fifo_segment_t *fs; int rv, alloc; @@ -2561,13 +2570,20 @@ sfifo_test_fifo_segment_prealloc (int verbose) SFIFO_TEST (clib_abs (rv - (int) free_space) < 512, "free space expected %u is %u", free_space, rv); - f = fifo_segment_alloc_fifo (fs, 200 << 10, FIFO_SEGMENT_RX_FIFO); + /* Use all free chunk memory */ + f = fifo_segment_alloc_fifo (fs, 100 << 10, FIFO_SEGMENT_RX_FIFO); SFIFO_TEST (f != 0, "fifo allocated"); + SFIFO_TEST (svm_fifo_is_sane (f), "fifo should be sane"); + + tf = fifo_segment_alloc_fifo (fs, 100 << 10, FIFO_SEGMENT_RX_FIFO); + SFIFO_TEST (tf != 0, "fifo allocated"); + SFIFO_TEST (svm_fifo_is_sane (tf), "fifo should be sane"); + rv = fifo_segment_num_free_chunks (fs, 4096); SFIFO_TEST (rv == 0, "prealloc chunks expected %u is %u", 0, rv); rv = fifo_segment_fl_chunk_bytes (fs); SFIFO_TEST (rv == 0, "chunk free space expected %u is %u", 0, rv); - SFIFO_TEST (svm_fifo_is_sane (f), "fifo should be sane"); + /* * Multiple preallocs that consume the remaining space @@ -2622,6 +2638,7 @@ sfifo_test_fifo_segment_prealloc (int verbose) * Cleanup */ fifo_segment_free_fifo (fs, old); + fifo_segment_free_fifo (fs, tf); close (fs->ssvm.fd); fifo_segment_delete (sm, fs); return 0; diff --git a/src/svm/fifo_segment.c b/src/svm/fifo_segment.c index cfc795418b2..06b7f063136 100644 --- a/src/svm/fifo_segment.c +++ b/src/svm/fifo_segment.c @@ -615,6 +615,9 @@ fs_try_alloc_fifo (fifo_segment_header_t * fsh, fifo_segment_slice_t * fss, min_size = clib_max ((fsh->pct_first_alloc * data_bytes) / 100, 4096); fl_index = fs_freelist_for_size (min_size); + if (fl_index >= vec_len (fss->free_chunks)) + return 0; + clib_spinlock_lock (&fss->chunk_lock); if (fss->free_fifos && fss->free_chunks[fl_index]) @@ -691,6 +694,7 @@ fsh_alloc_chunk (fifo_segment_header_t * fsh, u32 slice_index, u32 chunk_size) clib_spinlock_lock (&fss->chunk_lock); + ASSERT (vec_len (fss->free_chunks) > fl_index); c = fss->free_chunks[fl_index]; if (c) @@ -834,6 +838,9 @@ fifo_segment_alloc_fifo_w_slice (fifo_segment_t * fs, u32 slice_index, ASSERT (slice_index < fs->n_slices); + if (PREDICT_FALSE (data_bytes > 1 << fsh->max_log2_chunk_size)) + return 0; + fss = fsh_slice_get (fsh, slice_index); f = fs_try_alloc_fifo (fsh, fss, data_bytes); if (!f) diff --git a/src/svm/svm_fifo.h b/src/svm/svm_fifo.h index 0a3d17e42ea..e08b3e9dfa5 100644 --- a/src/svm/svm_fifo.h +++ b/src/svm/svm_fifo.h @@ -669,6 +669,8 @@ svm_fifo_size (svm_fifo_t * f) static inline void svm_fifo_set_size (svm_fifo_t * f, u32 size) { + if (size > (1 << f->fs_hdr->max_log2_chunk_size)) + return; fsh_virtual_mem_update (f->fs_hdr, f->slice_index, (int) f->size - size); f->size = size; }