https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70132
Bug ID: 70132
Summary: ARM -mcpu=native can cause a double free abort.
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: dariushardy1 at gmail dot com
Target Milestone: ---
When attempting to use cpu autodetection (either -mcpu=native or -march=native)
on ARM where the cpu isn't known by the detection routine e.g. Cortex-A53 in
aarch32 mode, the detection function attempts to fclose() a file twice.
gcc/config/arm/driver-arm.c
131 fclose (f);
132
133 if (val == NULL)
134 goto not_found;
135
136 return concat ("-m", argv[0], "=", val, NULL);
137
138 not_found:
139 {
140 unsigned int i;
141 unsigned int opt;
142 const char *search[] = {NULL, "arch"};
143
144 if (f)
145 fclose (f);
When the cpu identifier isn't know val=NULL when it enters this part and the
file f ("/proc/cpuinfo") will be closed on line 131, and then again at 145
causing an abort. Setting f = NULL after the first fclose() should prevent it
but it isn't done.
rpi3 is a Cortex-A53 running in aarch32 mode. Whilst the A53 is known and gcc
will compile for it, the autodetect code doesn't have it listed.
pi@rpi3:~ $ gcc -mcpu=native
*** Error in `gcc': double free or corruption (top): 0x00f5abd0 ***
Aborted
Noticed in 4.9.2, but the code for 5.3.0 appears to still have this.
pi@rpi3:~ $ gcc --version
gcc (Raspbian 4.9.2-10) 4.9.2
