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fatfs: prevent dynamic mount buffer leaks on mount failures

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Cursor Agent
2026-04-09 01:09:38 +00:00
parent 508ba7ae04
commit b76ddd9a0a
1 changed files with 10 additions and 4 deletions
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components/fatfs/src/ff.c
+10 -4
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@@ -3513,8 +3513,9 @@ static FRESULT mount_volume ( /* FR_OK(0): successful, !=0: an error occurred */
if (SS(fs) > FF_MAX_SS || SS(fs) < FF_MIN_SS || (SS(fs) & (SS(fs) - 1))) return FR_DISK_ERR;
#endif
#if FF_USE_DYN_BUFFER
fs->win = ff_memalloc(SS(fs)); /* Allocate memory for sector buffer */
if (!fs->win) return FR_NOT_ENOUGH_CORE;
if (fs->win) ff_memfree(fs->win); /* Discard sector buffer left by a failed mount */
fs->win = ff_memalloc(SS(fs)); /* Allocate memory for sector buffer */
if (!fs->win) return FR_NOT_ENOUGH_CORE;
#endif
/* Find an FAT volume on the hosting drive */
@@ -3768,8 +3769,10 @@ FRESULT f_mount (
ff_mutex_delete(vol);
#endif
#if FF_USE_DYN_BUFFER
if (cfs->fs_type) /* Check if the buffer was ever allocated */
ff_memfree(cfs->win); /* Deallocate buffer allocated for the filesystem object */
if (cfs->win) { /* Deallocate buffer allocated for the filesystem object */
ff_memfree(cfs->win);
cfs->win = 0;
}
#endif
cfs->fs_type = 0; /* Invalidate the filesystem object to be unregistered */
}
@@ -3790,6 +3793,9 @@ FRESULT f_mount (
#endif
#endif
fs->fs_type = 0; /* Invalidate the new filesystem object */
#if FF_USE_DYN_BUFFER
fs->win = 0;
#endif
FatFs[vol] = fs; /* Register it */
}