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Without this patch, the MH test suite would fail when building with
glibc 2.26, with 'ali' segfaulting like this:
Core was generated by `/tmp/guix-build-mailutils-3.4.drv-0/mailutils-3.4/mh/.libs/ali -a ./Mail/mh_ali'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f8eac263a14 in hash (
name=0x72642e342e332d73 <error: Cannot access memory at address 0x72642e342e332d73>, hash_num=0) at assoc.c:102
102 for (i = 0; *name; name++)
(gdb) bt
#0 0x00007f8eac263a14 in hash (
name=0x72642e342e332d73 <error: Cannot access memory at address 0x72642e342e332d73>, hash_num=0) at assoc.c:102
#1 0x00007f8eac263e6b in assoc_find_slot (assoc=0xaa59e0,
name=0x72642e342e332d73 <error: Cannot access memory at address 0x72642e342e332d73>, install=0x0, slot=0x7ffcddcbf2b8) at assoc.c:219
#2 0x00007f8eac264124 in mu_assoc_lookup (assoc=0xaa59e0,
name=0x72642e342e332d73 <error: Cannot access memory at address 0x72642e342e332d73>, dataptr=0x7ffcddcbf2e0) at assoc.c:308
#3 0x00007f8eac29e8ac in mu_ident_deref (
name=0x72642e342e332d73 <error: Cannot access memory at address 0x72642e342e332d73>) at ident.c:98
#4 0x00007f8eac29f8a6 in mu_locus_point_deinit (pt=0xaa5718) at locus.c:48
#5 0x00007f8eac29fa1b in mu_locus_range_deinit (lr=0xaa5718) at locus.c:99
#6 0x00007f8eac29f9db in mu_locus_range_copy (dest=0xaa5718,
src=0x622be0 <ali_yylloc>) at locus.c:89
#7 0x0000000000408a2a in push_source (name=0xaa74bc "mh_aliases2", fail=1)
at mh_alias_lex.l:170
commit b330af9008e4c9168b379867b854f5900a539ad7
Author: Sergey Poznyakoff <gray@gnu.org>
Date: Sat Nov 18 10:15:48 2017 +0200
Fix the use of uninitialized memory
* mh/mh_alias_lex.l (push_source): Initialize locus range prior to copying
to it.
* libmailutils/cfg/parser.y (mu_cfg_tree_create_node): Likewise.
* libmu_sieve/util.c: (mu_sieve_value_create): Likewise.
diff --git a/libmailutils/cfg/parser.y b/libmailutils/cfg/parser.y
index 4503c7781..3436b8d90 100644
--- a/libmailutils/cfg/parser.y
+++ b/libmailutils/cfg/parser.y
@@ -1134,10 +1134,9 @@ mu_cfg_tree_create_node (struct mu_cfg_tree *tree,
np = mu_alloc (size);
np->type = type;
+ mu_locus_range_init (&np->locus);
if (loc)
mu_locus_range_copy (&np->locus, loc);
- else
- memset (&np->locus, 0, sizeof np->locus);
p = (char*) (np + 1);
np->tag = p;
strcpy (p, tag);
diff --git a/libmu_sieve/sieve-lex.l b/libmu_sieve/sieve-lex.l
index fd145bfe1..f14e80194 100644
--- a/libmu_sieve/sieve-lex.l
+++ b/libmu_sieve/sieve-lex.l
@@ -190,6 +190,7 @@ push_source (const char *name)
{
ctx = mu_sieve_malloc (mu_sieve_machine, sizeof (*ctx));
ctx->trk = trk;
+ mu_locus_range_init (&ctx->incl_range);
mu_locus_range_copy (&ctx->incl_range, &yylloc);
ctx->i_node = sieve_source_inode;
ctx->input = input_stream;
diff --git a/libmu_sieve/util.c b/libmu_sieve/util.c
index 8d62a60c2..7d71b5509 100644
--- a/libmu_sieve/util.c
+++ b/libmu_sieve/util.c
@@ -55,6 +55,7 @@ mu_sieve_value_create (mu_sieve_machine_t mach, mu_sieve_data_type type,
val->locus.end.mu_line = locus->end.mu_line;
val->locus.end.mu_col = locus->end.mu_col;
+ mu_locus_range_init (&val->locus);
mu_locus_range_copy (&val->locus, locus);
switch (type)
{
diff --git a/mh/mh_alias_lex.l b/mh/mh_alias_lex.l
index 371353ed3..b97264b38 100644
--- a/mh/mh_alias_lex.l
+++ b/mh/mh_alias_lex.l
@@ -167,6 +167,7 @@ push_source (const char *name, int fail)
{
ctx = mu_alloc (sizeof (*ctx));
ctx->trk = trk;
+ mu_locus_range_init (&ctx->incl_range);
mu_locus_range_copy (&ctx->incl_range, &yylloc);
ctx->exec_p = exec_p;
ctx->i_node = ali_source_inode;
|