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inspect: Check /etc/lsb-release is not too large before calling head on it.

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This commit is contained in:
Richard W.M. Jones
2010-11-16 12:45:50 +00:00
parent a4448956e9
commit 35afe0cb33
1 changed files with 16 additions and 1 deletions
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17
src/inspect.c
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@@ -400,11 +400,26 @@ parse_major_minor (guestfs_h *g, struct inspect_fs *fs)
static int
parse_lsb_release (guestfs_h *g, struct inspect_fs *fs)
{
const char *filename = "/etc/lsb-release";
int64_t size;
char **lines;
size_t i;
int r = 0;
lines = guestfs_head_n (g, 10, "/etc/lsb-release");
/* Don't trust guestfs_head_n not to break with very large files.
* Check the file size is something reasonable first.
*/
size = guestfs_filesize (g, filename);
if (size == -1)
/* guestfs_filesize failed and has already set error in handle */
return -1;
if (size > 1000000) {
error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
filename, size);
return -1;
}
lines = guestfs_head_n (g, 10, filename);
if (lines == NULL)
return -1;