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[samtools.git] / bam_index.c

diff --git a/bam_index.c b/bam_index.c
index 9610a2656031657b796abc68bf32c1b6f1564745..d6b94e2413e1dab2d2dc4ce2c91e471854ddd35a 100644 (file)
--- a/bam_index.c
+++ b/bam_index.c
@@ -159,9 +159,14 @@ bam_index_t *bam_index_core(bamFile fp)
        bam1_core_t *c;
        uint64_t save_off, last_off, n_mapped, n_unmapped, off_beg, off_end, n_no_coor;
 
+       h = bam_header_read(fp);
+       if(h == 0) {
+           fprintf(stderr, "[bam_index_core] Invalid BAM header.");
+           return NULL;
+       }
+
        idx = (bam_index_t*)calloc(1, sizeof(bam_index_t));
        b = (bam1_t*)calloc(1, sizeof(bam1_t));
-       h = bam_header_read(fp);
        c = &b->core;
 
        idx->n = h->n_targets;